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Chemistry Question Papers

12th Standard English Medium Chemistry Reduced Syllabus Annual Exam Model Question Paper with Answer key - 2021 - by Saroja - Vellore - View & Read

  • 1)

    In Hall-Herold process___________act as an, anode.

  • 2)

    The compound that is used in nuclear reactors as protective shields and control rods is

  • 3)

    Helium is used in balloons in the place of, hydrogen because it is________

  • 4)

    Which one of the following is not correct?

  • 5)

    Which one of the following complexes is not expected to exhibit isomerism?

12th Standard English Medium Chemistry Reduced Syllabus Annual Exam Model Question Paper - 2021 - by Saroja - Vellore - View & Read

  • 1)

    Sodium. magnesium and aluminum can be obtained from their ore by

  • 2)

    Oxidation state of carbon in its hydrides

  • 3)

    S-S bond is present in

  • 4)

    The alloy of copper that contain Zinc is

  • 5)

    An excess of silver nitrate is added to 100ml of a 0.01M solution of pentaaquachloridochromium(III)chloride. The number of moles of AgCl precipitated would be

12th Standard English Medium Chemistry Reduced Syllabus Public Exam Model Question Paper with Answer key - 2021 - by Saroja - Vellore - View & Read

  • 1)

    The blistered appearance of Cu obtained from the reverberatory furance is due to evolution of

  • 2)

    The repeating unit in silicone is v

  • 3)

    The ionisation energy of Ga is higher than that of Al because of_________

  • 4)

    The magnetic moment of Mn2+ ion is

  • 5)

    IUPAC name of the complex K3[Al(C2O4)3] is 

12th Standard English Medium Chemistry Reduced Syllabus Public Exam Model Question Paper - 2021 - by Saroja - Vellore - View & Read

  • 1)

    Name the process by which elements such as germanium, silicon and galium are refined.

  • 2)

    The geometry at which carbon atom in diamond are bonded to each other is

  • 3)

    Pick the wrong one among the following

  • 4)

    Among the transition metals of 3d series, the one that has highest negative \(\left( \frac { M^{ 2+ } }{ M } \right) \) standard electrode potential is

  • 5)

    Which one of the following will give a pair of enantiomorphs?

12th Standard English Medium Chemistry Reduced Syllabus Creative Five mark Question with Answer key - 2021(Public Exam ) - by Saroja - Vellore - View & Read

  • 1)

    Explain refining of nickel by mond's process

  • 2)

    What are the various methods by which carbon-di-oxide is prepared?

  • 3)

    Give a detailed account on allotropes of sulphur.

  • 4)

    Explain the Deacon's process

  • 5)

    Complete the following reactions
    (i) Cr2O72-
    (ii) Cr2O7- + 6I-+ 14H+ ⟶
    (iii)  Cr2O7- + 3S2-+ 14H+ ⟶
    (iv) Cr2O7- + 3SO2+ 14H+
    (v) Cr2O7- +3Sn2+ + 14H+ ⟶
    (vi) K2Cr2O7 + 8H2SO4 + 3CH3CH2OH ⟶
    (vii) 2MnO4- + 5(COO)2- + 6H+ ⟶
    (viii) 2MnO4- + 10I+ 16H+
    (ix) 2MnO4- + 5S2-+ 16H+ ⟶
    (x) 2MnO4- + 5NO2- + 6H+ ⟶
    (xi) 2KMnO4 + 3H2SO4 + 5CH3CH2OH ⟶
    (xii) 2MnO4- + 5SO32- + 6H+

12th Standard English Medium Chemistry Reduced Syllabus Creative Three mark Question with Answer key - 2021(Public Exam ) - by Saroja - Vellore - View & Read

  • 1)

    Explain the electrometallurgy of aluminium

  • 2)

    Before reduction, the ore is first convertedI into the oxide of metal of interest. Gtve reason

  • 3)

    What is liquation?

  • 4)

    Write a short note on hydroboration

  • 5)

    Describe the structure of diamond.

12th Standard English Medium Chemistry Reduced Syllabus Creative Two mark Question with Answer key - 2021(Public Exam ) - by Saroja - Vellore - View & Read

  • 1)

    Name some common methods of ore concentration.

  • 2)

    Discuss the process of roasting with suitable example.

  • 3)

    Name some depressing agents

  • 4)

    What are the different methods of concentration of ores?

  • 5)

    Mention the physical properties of boranes.

12th Standard English Medium Chemistry Reduced Syllabus Creative One mark Question with Answer key - 2021(Public Exam ) - by Saroja - Vellore - View & Read

  • 1)

    In the froth-floatation process the collectors such as pine oil and xanthates, etc enhance.

  • 2)

    Malachite has______ composition.

  • 3)

    Magnesite is_________

  • 4)

    In the thermite proces__________is used as a reducing agent

  • 5)

    Graphite has

12th Standard English Medium Chemistry Reduced Syllabus Five mark Important Questions with Answer key - 2021(Public Exam ) - by Saroja - Vellore - View & Read

  • 1)

    Give the limitations of Ellingham diagram

  • 2)

    Explain refming of titanium by Van-Arkel method.

  • 3)

    Deduce the oxidation number of oxygen in hypofluorous acid – HOF.

  • 4)

    Give a detailed account on allotropes of sulphur.

  • 5)

    Explain the bleaching action of Chlorine.

12th Standard English Medium Chemistry Reduced Syllabus Five mark Important Questions - 2021(Public Exam ) - by Saroja - Vellore - View & Read

  • 1)

    The selection of reducing agent depends on the thermodynamic factor: Explain with an example.

  • 2)

    In the extraction of copper, explain the smelting process.

  • 3)

    How are silicates classified? Give an example for each type of silicate.

  • 4)

    What happens when PCl5 is heated?

  • 5)

    Mention the uses of helium

12th Standard English Medium Chemistry Reduced Syllabus Three mark Important Questions with Answer key - 2021(Public Exam ) - by Saroja - Vellore - View & Read

  • 1)

    Explain zone refining process with an example using the Ellingham diagram given below

  • 2)

    Explain alkali leaching in the extraction of aluminum,

  • 3)

    What is auto-reduction?

  • 4)

    Describe the structure of diborane

  • 5)

    How is aluminum chloride prepared from aluminum?

12th Standard English Medium Chemistry Reduced Syllabus Three mark Important Questions - 2021(Public Exam ) - by Saroja - Vellore - View & Read

  • 1)

    Explain zone refining process with an example using the Ellingham diagram given below

  • 2)

    Explain calcination with an example.

  • 3)

    Copper and silver lie low in the electrochemical series and yet they are found in the combined state as sulphides in nature. Comment.

  • 4)

    Describe the structure of diborane

  • 5)

    Describe the structure of diamond.

12th Standard English Medium Chemistry Reduced Syllabus Two mark Important Questions with Answer key - 2021(Public Exam ) - by Saroja - Vellore - View & Read

  • 1)

    What is the role of Limestone in the extraction of Iron from its oxide Fe2O3?

  • 2)

    Name some elements that occur as native elements.

  • 3)

    What is Ellingham diagram? or
    What does Ellingham diagram represent?

  • 4)

    What is calcination? Give example.

  • 5)

    What is catenation ? describe briefly the catenation property of carbon

12th Standard English Medium Chemistry Reduced Syllabus Two mark Important Questions - 2021(Public Exam ) - by Saroja - Vellore - View & Read

  • 1)

    What is the role of Limestone in the extraction of Iron from its oxide Fe2O3?

  • 2)

    Out of coke and CO, which is better reducing agent for the reduction of ZnO? Why?

  • 3)

    Name some elements that occur as native elements.

  • 4)

    What is leaching?

  • 5)

    Describe briefly allotropism in p- block elements with specific reference to carbon

12th Standard English Medium Chemistry Reduced Syllabus One mark Important Questions with Answer key - 2021(Public Exam ) - by Saroja - Vellore - View & Read

  • 1)

    Which one of the following reaction represents calcinations?

  • 2)

    Which one of the following is not feasible

  • 3)

    Extraction of gold and silver involves leaching with cyanide ion. silver is later recovered by (NEET-2017)

  • 4)

    Which of the following is not true with respect to Ellingham diagram?

  • 5)

    Which of the following metals has the largest abundance in the earth’s crust?

12th Standard English Medium Chemistry Reduced Syllabus One mark Important Questions - 2021(Public Exam ) - by Saroja - Vellore - View & Read

  • 1)

    Which one of the following reaction represents calcinations?

  • 2)

    In the extraction of aluminium from alumina by electrolysis, cryolite is added to

  • 3)

    An aqueous solution of borax is

  • 4)

    AlF3 is soluble in HF only in the presence of KF. It is due to the formation of (NEET)

  • 5)

    P4O6 reacts with cold water to give

12th Standard Chemistry English Medium Bio Molecules Reduced Syllabus Important Questions With Answer Key 2021 - by Saroja - Vellore - View & Read

  • 1)

    The central dogma of molecular genetics states that the genetic information flows from

  • 2)

    Among the following the achiral amino acid is

  • 3)

    Which one of the following is not produced by body?

  • 4)

    The number of sp2 and sp3 hybridised carbon in fructose are respectively

  • 5)

    The pyrimidine bases present in DNA are

12th Standard Chemistry English Medium Bio Molecules Reduced Syllabus Important Questions 2021 - by Saroja - Vellore - View & Read

  • 1)

    The correct corresponding order of names of four aldoses with configuration given below Respectively is,

  • 2)

    In a protein, various amino acids liked together by

  • 3)

    In aqueous solution of amino acids mostly exists in,

  • 4)

    The secondary structure of a protein refers to

  • 5)

    Complete hydrolysis of cellulose gives

12th Standard Chemistry English Medium Organic Nitrogen Compounds Reduced Syllabus Important Questions With Answer Key 2021 - by Saroja - Vellore - View & Read

  • 1)

    Aniline + benzoylchloride \(\overset { NaOH }{ \longrightarrow } \)C6H5 - NH - COC H this reaction is known as

  • 2)

    When aniline reacts with acetic anhydride the product formed is

  • 3)

  • 4)

    When  is reduced with Sn / HCl the pair of compounds formed are

  • 5)

    Among the following, the reaction that proceeds through an electrophilic substitution, is :

12th Standard Chemistry English Medium Organic Nitrogen Compounds Reduced Syllabus Important Questions 2021 - by Saroja - Vellore - View & Read

  • 1)

    Which one of the following will not undergo Hofmann bromamide reaction

  • 2)

    The product formed by the reaction an aldehyde with a prmary amine

  • 3)

    The order of basic strength for methyl substituted amines in aqueous solution is

  • 4)

    C6H5NO2 \(\overset { Fe/Hel }{ \longrightarrow } A\overset { { NaNO }_{ 2 }/HCl }{ \underset { 273K }{ \longrightarrow } } B\overset { { H }_{ 2 }O }{ \underset { 283 }{ \longrightarrow } } C\quad 'C'is\)

  • 5)

    Ammonium salt of benzoic acid is heated strongly with and the product so formed is reduced and then treated with NaNO2 / HCl at low temperature. The final compound formed is

12th Standard Chemistry English Medium Carbonyl Compounds and carboxylic acids Reduced Syllabus Important Questions With Answer Key 2021 - by Saroja - Vellore - View & Read

  • 1)

    Predict the product Z in the following series of reactions Ethanoic acid \(\overset { { PCI }_{ 5 } }{ \longrightarrow } X\overset { { C }_{ 6 }{ H }_{ 6 } }{ \underset { Anhydrous\quad AlcI }{ \longrightarrow } } Y\overset { 1){ CH }_{ 3 }MgBr }{ \underset { II){ H }_{ 3 }{ O }^{ + } }{ \longrightarrow } } Z.\)

  • 2)

    CH3Br \(\overset { KCN }{ \longrightarrow } (A)\overset { { H }_{ 2 }{ O }^{ + } }{ \longrightarrow } (B)\overset { { PCl }_{ 5 } }{ \longrightarrow } \) (C) product (c) is

  • 3)

    Assertion : p – N, N – dimethyl aminobenzaldehyde undergoes benzoin condensation
    Reason : The aldehydic (-CHO) group is meta directing

  • 4)

    Which one of the following reaction is an example of disproporationation reaction

  • 5)

    In which of the following reactions new carbon – carbon bond is not formed?

12th Standard Chemistry English Medium Carbonyl Compounds and carboxylic acids Reduced Syllabus Important Questions 2021 - by Saroja - Vellore - View & Read

  • 1)

    Which of the following represents the correct order of acidity in the given compounds

  • 2)

    Identify the product formed in the reaction 

  • 3)

    Which one of the following reaction is an example of disproporationation reaction

  • 4)

    Carboxylic acids have higher boiling points than aldehydes, ketones and even alcohols of comparable molecular mass. It is due to their

  • 5)

    Which of the following statement is wrong?

12th Standard Chemistry English Medium Hydroxy compounds and ethers Reduced Syllabus Important Questions With Answer Key 2021 - by Saroja - Vellore - View & Read

  • 1)

    In which type of parthenogenesis are only males produced?

  • 2)

    The mode of reproduction in bacteria is by

  • 3)

    The mature sperms are stored in the

  • 4)

    The milk secreted by the mammary glands soon after child birth is called

  • 5)

    A – Head of the sperm consists of acrosome and mitochondria.
    R – Acrosome contains spiral rows of mitochondria.

12th Standard Chemistry English Medium Hydroxy compounds and ethers Reduced Syllabus Important Questions 2021 - by Saroja - Vellore - View & Read

  • 1)

    The reaction

    Can be classified as

  • 2)

    Among the following ethers which one will produce methyl alcohol on treatment with hot HI?

  • 3)

    Higher alcohols are not soluble in water because of

  • 4)

    Compound of molecular formula C7H8O. is a sweet smeeling liquid. A on reaction with acidified K2Cr2O7 gives compound B of molecular formula C7H8O. B reduces Tollen's reagent A and B are respectively.

  • 5)

    Ethers in the presence of atmospheric oxygen oxidises to give hydroperoxides and dialkyl peroxides Such a spontaneous reaction by atmospheric oxygen is called _________

12th Standard Chemistry English Medium Surface Chemistry Reduced Syllabus Important Questions With Answer Key 2021 - by Saroja - Vellore - View & Read

  • 1)

    Which one of the following is an example for homogeneous catalysis?

  • 2)

    Match the following

    a V2O5 i High density polyethylene
    b Ziegler – Natta ii PAN
    c Peroxide iii NH3
    d Finely divided Fe iv H2SO4
  • 3)

    On which of the following properties does the coagulating power of an ion depend ?

  • 4)

    Which among the following does not affect adsorption?

  • 5)

    Pick the odd one out.

12th Standard Chemistry English Medium Surface Chemistry Reduced Syllabus Important Questions 2021 - by Saroja - Vellore - View & Read

  • 1)

    For freudlich isotherm a graph of log \(\frac{x}{m}\) is plotted against log P. The slope of the line and its y – axis intercept respectively corresponds to

  • 2)

    Which one of the following characteristics are associated with adsorption?

  • 3)

    Which one of the following is an example for homogeneous catalysis?

  • 4)

    Which among the following true regarding adsorption?
    (i) Adsorption is a spontaneous process
    (ii) Adsorption is always accompanied by increase in free energy.
    (iii) Adsorption is an endothermic process
    (iv) Adsorption can occur in all interfacial surfaces.

  • 5)

    According to Freundlich adsorption isotherm,

12th Standard Chemistry English Medium Electro Chemistry Reduced Syllabus Important Questions With Answer Key 2021 - by Saroja - Vellore - View & Read

  • 1)

    The number of electrons that have a total charge of 9650 coulombs is

  • 2)

    Faradays constant is defined as

  • 3)

    While charging lead storage battery

  • 4)

    Among the following cells
    I) Leclanche cell
    II) Nickel – Cadmium cell
    III) Lead storage battery
    IV) Mercury cell
    Primary cells are

  • 5)

    The equivalent conductance of M/36solution of a weak monobasic acid is 6mho cm2 and at infinite dilution is 400 mho cm2. The dissociation constant of this acid is

12th Standard Chemistry English Medium Electro Chemistry Reduced Syllabus Important Questions 2021 - by Saroja - Vellore - View & Read

  • 1)

    Which of the following electrolytic solution has the least specific conductance

  • 2)

    Zinc can be coated on iron to produce galvanized iron but the reverse is not possible. It is because

  • 3)

    The equivalent conductance of M/36solution of a weak monobasic acid is 6mho cm2 and at infinite dilution is 400 mho cm2. The dissociation constant of this acid is

  • 4)

    A conductivity cell has been calibrated with a 0.01M, 1:1 electrolytic solution (specific conductance ( k =1.25x10-3cm-1) in the cell and the measured resistance was 800 Ω at 25oC. The cell constant is,

  • 5)

    Kohlraush's law is applied to calculate

12th Standard Chemistry English Medium Ionic Equillibrium Reduced Syllabus Important Questions With Answer Key 2021 - by Saroja - Vellore - View & Read

  • 1)

    Concentration of the Ag+ ions in a saturated solution of Ag2C2O4 is 2.24 ×10-4mol L-1 solubility product of Ag2C2O4 is

  • 2)

    pH of a saturated solution of Ca(OH)2 is 9. The Solubility product ( Ksp) of Ca(OH)2

  • 3)

    Which will make basic buffer?

  • 4)

    What is the decreasing order of strength of bases
    OH, NH2- H - C ≡ C and CH3 - CH2-

  • 5)

    If the solubility product of lead iodide is 3.2 ×10-8 , its solubility will be

12th Standard Chemistry English Medium Ionic Equillibrium Reduced Syllabus Important Questions 2021 - by Saroja - Vellore - View & Read

  • 1)

    Concentration of the Ag+ ions in a saturated solution of Ag2C2O4 is 2.24 ×10-4mol L-1 solubility product of Ag2C2O4 is

  • 2)

    pH of a saturated solution of Ca(OH)2 is 9. The Solubility product ( Ksp) of Ca(OH)2

  • 3)

    Conjugate base for bronsted acids H2O and HF are

  • 4)

    Which will make basic buffer?

  • 5)

    MY and NY3, are insoluble salts and have the same Ksp values of 6.2 ×10-13 at room temperature. Which statement would be true with regard to MY and NY3?

12th Standard Chemistry English Medium Chemical Kinetics Reduced Syllabus Important Questions With Answer Key 2021 - by Saroja - Vellore - View & Read

  • 1)

    The addition of a catalyst during a chemical reaction alters which of the following quantities? (NEET)

  • 2)

    What would be the activation energy of a reaction when the temperature is increased from 27oC to 37oC?

  • 3)

    Which of the following statement is not correct?

  • 4)

    The given reaction
    2 FeCl3 + SnCl2 ⟶ 2FeCl2 + SnCl4 is an example of

  • 5)

    Activation energy of a chemical reaction can be determined by

12th Standard Chemistry English Medium Chemical Kinetics Reduced Syllabus Important Questions 2021 - by Saroja - Vellore - View & Read

  • 1)

    For a first order reaction A ⟶ B the rate constant is x min−1. If the initial concentration of A is 0.01M , the concentration of A after one hour is given by the expression.

  • 2)

    The addition of a catalyst during a chemical reaction alters which of the following quantities? (NEET)

  • 3)

    Consider the following statements :
    (i) increase in concentration of the reactant increases the rate of a zero order reaction.
    (ii) rate constant k is equal to collision frequency A if Ea = 0
    (iii) rate constant k is equal to collision frequency A if Ea =0
    (iv) a plot of ln (k) vs T is a straight line.
    (v) a plot of ln (k) vs \(\left( \cfrac { 1 }{ T } \right) \) is a straight line with a positive slope.
    Correct statements are

  • 4)

    Which of the following statement is not correct?

  • 5)

    For an exothermic chemical process occurring in 2 steps as
    (i) A +B ⟶ X (slow) ;
    (ii) X ⟶  AB (fast)
    The progress of the reaction can be best described by (x- intermediate).

12th Standard Chemistry English Medium Solid State Reduced Syllabus Important Questions With Answer Key 2021 - by Saroja - Vellore - View & Read

  • 1)

    Solid CO2 is an example of

  • 2)

    In a solid atom M occupies ccp lattice and \(\left( \cfrac { 1 }{ 3 } \right) \) of tetrahedral voids are occupied by atom N. find the formula of solid formed by M and N.

  • 3)

    A two dimensional solid pattern formed by two different atoms X and Y is shown below. The black and white squares represent atoms X and Y respectively. the simplest formula for the compound based on the unit cell from the pattern is

  • 4)

    Which of the following cannot be regarded as molecular solid?

  • 5)

    What is the relation between diamond and .graphite?

12th Standard Chemistry English Medium Solid State Reduced Syllabus Important Questions 2021 - by Saroja - Vellore - View & Read

  • 1)

    An ionic compound AxBy crystallizes in fcc type crystal structure with B ions at the centre of each face and A ion occupying entre of the cube. the correct formula of AxBy is

  • 2)

    The ionic radii of A+ and B are 098X10-10 mand 1.81X10-10. m. the coordination number of each ion in AB is

  • 3)

    The yellow colour in NaCl crystal is due to

  • 4)

    Schottky defect in a crystal is observed when

  • 5)

    Assertion: due to Frenkel defect, density of the crystalline solid decreases.
    Reason: in Frenkel defect cation and anion leaves the crystal

12th Standard Chemistry English Medium Coordination Chemistry Reduced Syllabus Important Questions With Answer Key 2021 - by Saroja - Vellore - View & Read

  • 1)

    The sum of primary valence and secondary valence of the metal M in the complex [M(en)2(Ox)]Cl isL

  • 2)

    An excess of silver nitrate is added to 100ml of a 0.01M solution of pentaaquachloridochromium(III)chloride. The number of moles of AgCl precipitated would be

  • 3)

    Crystal field stabilization energy for high spin d5 octahedral complex is

  • 4)

    A complex in which the oxidation number of the metal is zero is

  • 5)

    The total number of electrons donated by ligands to platinum ion in [Pt(en)2CI2] is

12th Standard Chemistry English Medium Coordination Chemistry Reduced Syllabus Important Questions 2021 - by Saroja - Vellore - View & Read

  • 1)

    A complex has a molecular formula MSOCl. 6HO42.The aqueous solution of it gives white precipitate with Barium chloride solution and no precipitate is obtained when it is treated with silver nitrate solution. If the secondary valence of the metal is six, which one of the following correctly represents the complex?

  • 2)

    In which of the following coordination entities the magnitude of Δ0 will be maximum?

  • 3)

    Choose the correct statement

  • 4)

    The total number of electrons donated by ligands to platinum ion in [Pt(en)2CI2] is

  • 5)

    [Fe(H2O)6]3+ and [Fe(CN)6]3- differ in

12th Standard Chemistry English Medium Transition and inner transition Elements Reduced Syllabus Important Questions With Answer Key 2021 - by Saroja - Vellore - View & Read

  • 1)

    Which of the following d block element has half filled penultimate d sub shell as well as half filled valence sub shell?

  • 2)

    the catalytic behaviour of transition metals and their compounds is ascribed mainly due to

  • 3)

    The correct order of increasing oxidizing power in the series

  • 4)

    Which of the following statements is not true?

  • 5)

    MnO4- react with Br- in alkaline PH to give

12th Standard Chemistry English Medium Transition and inner transition Elements Reduced Syllabus Important Questions 2021 - by Saroja - Vellore - View & Read

  • 1)

    Sc( Z=21) is a transition element but Zinc (z=30) is not becaus

  • 2)

    Which of the following d block element has half filled penultimate d sub shell as well as half filled valence sub shell?

  • 3)

    the catalytic behaviour of transition metals and their compounds is ascribed mainly due to

  • 4)

    The correct order of increasing oxidizing power in the series

  • 5)

    The alloy of copper that contain Zinc is

12th Standard Chemistry English Medium P - Block Elements - II Reduced Syllabus Important Questions With Answer Key 2021 - by Saroja - Vellore - View & Read

  • 1)

    Which is true regarding nitrogen?

  • 2)

    The molarity of given orthophosphoric acid solution is 2M. its normality is

  • 3)

    The correct order of the thermal stability of hydrogen halide is

  • 4)

    Which one of the following compounds is not formed?

  • 5)

    Which one of the following orders is correct for the bond dissociation enthalpy of halogen molecules?

12th Standard Chemistry English Medium P - Block Elements - II Reduced Syllabus Important Questions 2021 - by Saroja - Vellore - View & Read

  • 1)

    In the brown ring test, brown colour of the ring is due to

  • 2)

    On hydrolysis, PCl3 gives

  • 3)

    Assertion : bond dissociation energy of fluorine is greater than chlorine gas
    Reason: chlorine has more electronic repulsion than fluorine.

  • 4)

    Which one of the following compounds is not formed?

  • 5)

    XeF6 on complete hydrolysis produces

12th Standard Chemistry English Medium P - Block Elements - I Reduced Syllabus Important Questions With Answer Key 2021 - by Saroja - Vellore - View & Read

  • 1)

    Boric acid is an acid because its molecule (NEET)

  • 2)

    Oxidation state of carbon in its hydrides

  • 3)

    The basic structural unit of silicates is (NEET)

  • 4)

    Which of these is not a monomer for a high molecular mass silicone polymer?

  • 5)

    Which of the following statements is not correct?

12th Standard Chemistry English Medium P - Block Elements - I Reduced Syllabus Important Questions 2021 - by Saroja - Vellore - View & Read

  • 1)

    Boric acid is an acid because its molecule (NEET)

  • 2)

    In diborane, the number of electrons that accounts for banana bonds is

  • 3)

    Carbon atoms in fullerene with formula C60 have

  • 4)

    Oxidation state of carbon in its hydrides

  • 5)

    The repeating unit in silicone is v

12th Standard Chemistry English Medium Metallurgy Reduced Syllabus Important Questions With Answer Key 2021 - by Saroja - Vellore - View & Read

  • 1)

    Match items in column - I with the items of column – II and assign the correct code.
     

           Column-I      Column-II
    A. Cyanide process (i) Ultrapure Ge
    B Froth floatation process (ii) Dressing of ZnS
    C Electrolytic reduction (iii) Extraction of Al
    D Zone refining (iv) Extraction of Au
        (v) Purification of Ni
  • 2)

    Which one of the following is not feasible

  • 3)

    Cupellation is a process used for the refining of

  • 4)

    Which of the following is commonly used to produce foam in froth floatation process?

  • 5)

    In the extraction of copper from its sulphide ore, the metal is finally obtained by the reduction of cuprous oxide with

12th Standard Chemistry English Medium Metallurgy Reduced Syllabus Important Questions 2021 - by Saroja - Vellore - View & Read

  • 1)

    Match items in column - I with the items of column – II and assign the correct code.
     

           Column-I      Column-II
    A. Cyanide process (i) Ultrapure Ge
    B Froth floatation process (ii) Dressing of ZnS
    C Electrolytic reduction (iii) Extraction of Al
    D Zone refining (iv) Extraction of Au
        (v) Purification of Ni
  • 2)

    Which one of the following ores is best concentrated by froth – floatation method?

  • 3)

    Considering Ellingham diagram, which of the following metals can be used to reduce alumina? (NEET-2018)

  • 4)

    The following set of reactions are used in refining Zirconium 
    \((impure)+2I_{ 2 }\overset { 523k }{ \longrightarrow } ZrI_{ 4 }\)
    \({ ZrI }_{ 4 }\overset { 1800K }{ \longrightarrow } Zr(pure)+{ 2I }_{ 2 }\) 
    This method is known as 

  • 5)

    Which of the following is incorrect with respect to metallurgy of iron in the blast furnace?

12th Standard Chemistry English Medium Reduced Syllabus Model Question paper With Answer Key -2021 Part - 2 - by Saroja - Vellore - View & Read

  • 1)

    The metal oxide which cannot be reduced to metal by carbon is

  • 2)

    Which of the following is used for concentrating ore in metallurgy?

  • 3)

    The geometry at which carbon atom in diamond are bonded to each other is

  • 4)

    Among the following, which is the strongest oxidizing agent?

  • 5)

    The magnetic moment of Mn2+ ion is

12th Standard Chemistry English Medium Reduced Syllabus Model Question paper With Answer Key - 2021 Part - 1 - by Saroja - Vellore - View & Read

  • 1)

    Zinc is obtained from ZnO by

  • 2)

    In the electrolytic refining of copper, which one of the following is used as anode?

  • 3)

    The blistered appearance of Cu obtained from the reverberatory furance is due to evolution of

  • 4)

    Assertion : bond dissociation energy of fluorine is greater than chlorine gas
    Reason: chlorine has more electronic repulsion than fluorine.

  • 5)

    Which of the following d block element has half filled penultimate d sub shell as well as half filled valence sub shell?

12th Standard Chemistry English Medium Reduced Syllabus Model Question paper - 2021 Part - 2 - by Saroja - Vellore - View & Read

  • 1)

    Which of the following statements, about the advantage of roasting of sulphide ore before reduction is not true?

  • 2)

    Extraction of gold and silver involves leaching with cyanide ion. silver is later recovered by (NEET-2017)

  • 3)

    Which of the following plot gives Ellingham diagram

  • 4)

    The basic structural unit of silicates is (NEET)

  • 5)

    XeF6 on complete hydrolysis produces

12th Standard Chemistry English Medium Reduced Syllabus Model Question paper - 2021 Part - 1 - by Saroja - Vellore - View & Read

  • 1)

    Zinc is obtained from ZnO by

  • 2)

    Which of the following is not true with respect to Ellingham diagram?

  • 3)

    Oxidation state of carbon in its hydrides

  • 4)

    Which of the following is strongest acid among all?

  • 5)

    Which one of the following statements related to lanthanons is incorrect?

12th Standard Chemistry English Medium Reduced Syllabus Important Questions with Answer key - 2021 Part - 2 - by Saroja - Vellore - View & Read

  • 1)

    Which one of the following reaction represents calcinations?

  • 2)

    Electrochemical process is used to extract

  • 3)

    Extraction of gold and silver involves leaching with cyanide ion. silver is later recovered by (NEET-2017)

  • 4)

    In the Ellingham diagram, for the formation of carbon monoxide

  • 5)

    \({ Zn }_{ (s) }+2\left[ Au(CN)_{ 2 } \right] ^{ - }_{ (aq) }\longrightarrow \left[ Zn(CN)_{ 4 } \right] ^{ 2- }_{ (aq) }+2Au{ { u }_{ (s) } }\) In the above equation) the oxidation state of metallic;gold is_______

12th Standard Chemistry English Medium Reduced Syllabus Important Questions with Answer key - 2021 Part - 1 - by Saroja - Vellore - View & Read

  • 1)

    Which of the following statements, about the advantage of roasting of sulphide ore before reduction is not true?

  • 2)

    The following set of reactions are used in refining Zirconium 
    \((impure)+2I_{ 2 }\overset { 523k }{ \longrightarrow } ZrI_{ 4 }\)
    \({ ZrI }_{ 4 }\overset { 1800K }{ \longrightarrow } Zr(pure)+{ 2I }_{ 2 }\) 
    This method is known as 

  • 3)

    In diborane, the number of electrons that accounts for banana bonds is

  • 4)

    The compound that is used in nuclear reactors as protective shields and control rods is

  • 5)

    Which of the following d block element has half filled penultimate d sub shell as well as half filled valence sub shell?

12th Standard Chemistry English Medium Reduced Syllabus Important Questions - 2021 Part - 2 - by Saroja - Vellore - View & Read

  • 1)

    The element that does not show catenation among the following p-block elements is

  • 2)

    Which one of the following orders is correct for the bond dissociation enthalpy of halogen molecules?

  • 3)

    Which of the following d block element has half filled penultimate d sub shell as well as half filled valence sub shell?

  • 4)

    The most common oxidation state of actinoids is

  • 5)

    The general electronic configuration of d-block elements can be written as __________

12th Standard Chemistry English Medium Reduced Syllabus Important Questions - 2021 Part - 1 - by Saroja - Vellore - View & Read

  • 1)

    Considering Ellingham diagram, which of the following metals can be used to reduce alumina? (NEET-2018)

  • 2)

    Name the process by which elements such as germanium, silicon and galium are refined.

  • 3)

    The element that does not show catenation among the following p-block elements is

  • 4)

    The repeating unit in silicone is v

  • 5)

    The geometry at which carbon atom in diamond are bonded to each other is

12th Standard Chemistry English Medium Free Online Test One Mark Questions with Answer Key 2020 - Part Nine - by Saroja - Vellore - View & Read

  • 1)

    Which among the following is not a borane?

  • 2)

    On moving down the group 13, density ______

  • 3)

    Among the following the correct order of acidity is

  • 4)

    Permanganate ion changes to ________ in acidic medium

  • 5)

    A complex in which the oxidation number of the metal is zero is

12th Standard Chemistry English Medium Free Online Test 1 Mark Questions 2020 - Part Ten - by Saroja - Vellore - View & Read

  • 1)

    In the extraction of aluminium from alumina by electrolysis, cryolite is added to

  • 2)

    AlF3 is soluble in HF only in the presence of KF. It is due to the formation of (NEET)

  • 3)

    On oxidation with iodine, sulphite ion is transformed to

  • 4)

    hot concentrated H2SO4 is miderately strong oxidising agent which of the following reactions does not show oxidising behaviour?

  • 5)

    Which of the following lanthanoid ions is diamagnetic?

12th Standard Chemistry English Medium Free Online Test 1 Mark Questions 2020 - Part Nine - by Saroja - Vellore - View & Read

  • 1)

    In the Ellingham diagram, for the formation of carbon monoxide

  • 2)

    Which of the following statements is not true?

  • 3)

    The primary and secondary valencies of [CoCl2(en)2]SO4 are respectively_____________

  • 4)

     if ‘a’ stands for the edge length of the cubic system ; sc , bcc, and fcc. Then the ratio of radii of spheres in these systems will be respectively

  • 5)

    On which of the following properties does the coagulating power of an ion depend ?

12th Standard Chemistry English Medium Free Online Test One Mark Questions with Answer Key 2020 - Part Eight - by Saroja - Vellore - View & Read

  • 1)

    Which of the following is used for concentrating ore in metallurgy?

  • 2)

    In the froth-floatation process the collectors such as pine oil and xanthates, etc enhance.

  • 3)

    The compound that is used in nuclear reactors as protective shields and control rods is

  • 4)

    An element belongs to group 15 and 3 rd period of the periodic table, its electronic configuration would be

  • 5)

    Coinage metals are _________

12th Standard Chemistry English Medium Free Online Test 1 Mark Questions 2020 - Part Eight - by Saroja - Vellore - View & Read

  • 1)

    Electrochemical process is used to extract

  • 2)

    Oxidation state of carbon in its hydrides

  • 3)

    Group 14 elements have general electronic configuration _______

  • 4)

    the catalytic behaviour of transition metals and their compounds is ascribed mainly due to

  • 5)

    The hypothetical complex triamminediaqua chloridocobalt (III)chloride can be represented as

12th Standard Chemistry English Medium Free Online Test One Mark Questions with Answer Key 2020 - Part Seven - by Saroja - Vellore - View & Read

  • 1)

    Considering Ellingham diagram, which of the following metals can be used to reduce alumina? (NEET-2018)

  • 2)

    Na[Ag(CN)2] is _________.

  • 3)

    Which of the following is not sp2 hybridised?

  • 4)

    All elements except carbon have the tendency to show maximum covalency of six ______

  • 5)

    In acid medium, potassium permanganate oxidizes oxalic acid to

12th Standard Chemistry English Medium Free Online Test One Mark Questions with Answer Key 2020 - Part Six - by Saroja - Vellore - View & Read

  • 1)

    Extraction of gold and silver involves leaching with cyanide ion. silver is later recovered by (NEET-2017)

  • 2)

    Which one is correct statement for zeolite?

  • 3)

    If'a' is the length of unit cell, then which one is correct relationship?

  • 4)

    Assertion: rate of reaction doubles when the concentration of the reactant is doubles if it is a first order reaction.
    Reason: rate constant also doubles

  • 5)

    What would be the activation energy of a reaction when the temperature is increased from 27oC to 37oC?

12th Standard Chemistry English Medium Free Online Test 1 Mark Questions 2020 - Part Seven - by Saroja - Vellore - View & Read

  • 1)

    Electrochemical process is used to extract

  • 2)

    Duralumin is an alloy of

  • 3)

    Which of the following compounds is colourless?

  • 4)

    Formula of tris(ethane-1,2-diamine)iron(II)phosphate

  • 5)

    if ‘a’ is the length of the side of the cube, the distance between the body centered atom and one corner atom in the cube will be

12th Standard Chemistry English Medium Free Online Test 1 Mark Questions 2020 - Part Six - by Saroja - Vellore - View & Read

  • 1)

    The incorrect statement among the following is

  • 2)

    In Hall-Herold process___________act as an, anode.

  • 3)

    Silicones are ______

  • 4)

    An element belongs to group 15 and 3 rd period of the periodic table, its electronic configuration would be

  • 5)

    Which one of the following is not correct?

12th Standard Chemistry English Medium Free Online Test One Mark Questions with Answer Key 2020 - Part Five - by Saroja - Vellore - View & Read

  • 1)

    In the electrolytic refining of copper, which one of the following is used as anode?

  • 2)

    Zinc blende is_________

  • 3)

    Aluminium is used for making alloys because of its _____

  • 4)

    The basicity of pyrophosphorous acid ( H4P2O5) is

  • 5)

    An example of a chelating ligand is

12th Standard Chemistry English Medium Free Online Test 1 Mark Questions 2020 - Part Five - by Saroja - Vellore - View & Read

  • 1)

    Zinc is obtained from ZnO by

  • 2)

    Sodium cyanide solution is used to extract _________from its ores

  • 3)

    The basic structural unit of silicates is (NEET)

  • 4)

    The basicity of pyrophosphorous acid ( H4P2O5) is

  • 5)

    XeF6 on complete hydrolysis produces

12th Standard Chemistry English Medium Free Online Test One Mark Questions with Answer Key 2020 - Part Four - by Saroja - Vellore - View & Read

  • 1)

    Which of the following is used for concentrating ore in metallurgy?

  • 2)

    The basic structural unit of silicates is (NEET)

  • 3)

    Most easily liquefiable gas is

  • 4)

    Assertion : Ce4+ is used as an oxidizing agent in volumetric analysis.
    Reason: Ce4+ has the tendency of attaining +3 oxidation state.

  • 5)

    The coordination number of Ni(II) in [Ni(CN)4]2- is

12th Standard Chemistry English Medium Free Online Test 1 Mark Questions 2020 - Part Four - by Saroja - Vellore - View & Read

  • 1)

    In the Ellingham diagram, for the formation of carbon monoxide

  • 2)

    Identify the metal that occurs in free state

  • 3)

    The element that does not show catenation among the following p-block elements is

  • 4)

    Group 14 elements have general electronic configuration _______

  • 5)

    On hydrolysis, PCl3 gives

12th Standard Chemistry English Medium Free Online Test One Mark Questions with Answer Key 2020 - Part Three - by Saroja - Vellore - View & Read

  • 1)

    Considering Ellingham diagram, which of the following metals can be used to reduce alumina? (NEET-2018)

  • 2)

    Identify the metal that occurs in free state

  • 3)

    Which of the following is not sp2 hybridised?

  • 4)

    the catalytic behaviour of transition metals and their compounds is ascribed mainly due to

  • 5)

    In which of the following coordination entities the magnitude of Δ0 will be maximum?

12th Standard Chemistry English Medium Free Online Test 1 Mark Questions 2020 - Part Three - by Saroja - Vellore - View & Read

  • 1)

    Which of the following will give respective metal by self reduction?

  • 2)

    Magnetic separation it is based on the difference in the_________ of the ore and the impurities.

  • 3)

    In diborane, the number of electrons that accounts for banana bonds is

  • 4)

    SiO44- ion has ____ geometry.

  • 5)

    Solid (A) reacts with strong aqueous NaOH liberating a foul smelling gas(B) which spontaneously burn in air giving smoky rings. A and B are respectively

12th Standard Chemistry English Medium Free Online Test One Mark Questions with Answer Key 2020 - Part Two - by Saroja - Vellore - View & Read

  • 1)

    Duralumin is an alloy of

  • 2)

    On hydrolysis, PCl3 gives

  • 3)

    Most easily liquefiable gas is

  • 4)

    In acid medium, potassium permanganate oxidizes oxalic acid to

  • 5)

    Which one of the following is not correct?

12th Standard Chemistry English Medium Free Online Test 1 Mark Questions 2020 - Part Two - by Saroja - Vellore - View & Read

  • 1)

    Which of the following statements, about the advantage of roasting of sulphide ore before reduction is not true?

  • 2)

    Electrochemical process is used to extract

  • 3)

    Cinnabar is the sulphide ore of_________metal.

  • 4)

    The element that does not show catenation among the following p-block elements is

  • 5)

    In the brown ring test, brown colour of the ring is due to

12th Standard Chemistry English Medium Free Online Test One Mark Questions with Answer Key 2020 - by Saroja - Vellore - View & Read

  • 1)

    The metal oxide which cannot be reduced to metal by carbon is

  • 2)

    Which one of the following ores is best concentrated by froth – floatation method?

  • 3)

    Among the following, one does not belong to calcination, Pick the odd one out.

  • 4)

    Carbon atoms in fullerene with formula C60 have

  • 5)

    An element belongs to group 15 and 3 rd period of the periodic table, its electronic configuration would be

12th Standard Chemistry English Medium Free Online Test 1 Mark Questions 2020 - by Saroja - Vellore - View & Read

  • 1)

    Wolframite ore is separated from tinstone by the process of

  • 2)

    The incorrect statement among the following is

  • 3)

    Which of the following is incorrect with respect to metallurgy of iron in the blast furnace?

  • 4)

    Which of the following metals has the largest abundance in the earth’s crust?

  • 5)

    The geometry at which carbon atom in diamond are bonded to each other is

12th Standard Chemistry English Medium Free Online Test Volume 2 One Mark Questions with Answer Key 2020 - by Saroja - Vellore - View & Read

  • 1)

    The aqueous solutions of sodium formate, anilinium chloride and potassium cyanide are respectively

  • 2)

    With regard to the strength of acids and bases, Find the incorrect statement among the following.

  • 3)

    The conjugate base of NH-2 is

  • 4)

    How many faradays of electricity are required for the following reaction to occur
    MnO→ Mn 4-

  • 5)

    Using the data given below fmd out the strongest reducing agent
    \({ E }_{ { Cr }_{ 2 }{ O }_{ 7 }^{ 2- } }^{ o }{ Cr }^{ 3+ }=1.33V{ ,E }_{ { Cl }_{ 2 }{ / }{ Cl }^{ - } }^{ o }=1.36V\)
    \({ E }_{ { Mn }O_{ 4 }^{ - } }^{ 0 }/{ Mn }^{ 2+ }=1.51V,{ E }_{ { Cr }^{ 3+ }/Cr }^{ o }=-0.74V\)

12th Standard Chemistry English Medium Free Online Test Volume 2 One Mark Questions 2020 - by Saroja - Vellore - View & Read

  • 1)

    What is the decreasing order of strength of bases
    OH, NH2- H - C ≡ C and CH3 - CH2-

  • 2)

    With regard to the strength of acids and bases, Find the incorrect statement among the following.

  • 3)

    A current strength of 3.86 A was passed through molten Calcium oxide for 41minutes and 40 seconds. The mass of Calcium in grams deposited at the cathode is (atomic mass of Ca is 40g / mol and 1F = 96500C).

  • 4)

    Which of the statements about electrolytic conductance is not true?

  • 5)

    The most effective electrolyte for the coagulation of AS2S3Sol is

12th Standard Chemistry English Medium Free Online Test Volume 1 One Mark Questions with Answer Key 2020 - by Saroja - Vellore - View & Read

  • 1)

    Which one of the following is not feasible

  • 2)

    The percentage of carbon in high carbon steel is_________

  • 3)

    Which of the following metals has the largest abundance in the earth’s crust?

  • 4)

    On hydrolysis, PCl3 gives

  • 5)

    Assertion : bond dissociation energy of fluorine is greater than chlorine gas
    Reason: chlorine has more electronic repulsion than fluorine.

12th Standard Chemistry English Medium Free Online Test Volume 1 One Mark Questions 2020 - by Saroja - Vellore - View & Read

  • 1)

    Which one of the following ores is best concentrated by froth – floatation method?

  • 2)

    Pick out the alloy that contains a non-metal as a constituent in it

  • 3)

    The element that does not show catenation among the following p-block elements is

  • 4)

    In the brown ring test, brown colour of the ring is due to

  • 5)

    The correct order of increasing oxidizing power in the series

12th Standard Chemistry Chemistry In Everyday Life English Medium Free Online Test One Mark Questions with Answer Key 2020 - 2021 - by Saroja - Vellore - View & Read

  • 1)

    Dettol is the mixture of

  • 2)

    Natural rubber has

  • 3)

    Which one of the following is a bio-degradable polymer?

  • 4)

    The drug used to induce sleep is

  • 5)

    A mixture of chloroxylenol and terpinecol acts as

12th Standard Chemistry Chemistry In Everyday Life English Medium Free Online Test One Mark Questions 2020 - 2021 - by Saroja - Vellore - View & Read

  • 1)

    Which of the following is an analgesic?

  • 2)

    Antiseptics and disinfectants either kill or prevent growth of microorganisms. Identify which of the following statement is not true

  • 3)

    Which one of the following structures represents nylon 6,6 polymer?

  • 4)

    Nylon is an example of

  • 5)

    Non stick cook wares generally have a coating of a polymer, whose monomer is

12th Standard Chemistry Biomolecules English Medium Free Online Test One Mark Questions with Answer Key 2020 - 2021 - by Saroja - Vellore - View & Read

  • 1)

    The correct corresponding order of names of four aldoses with configuration given below Respectively is,

  • 2)

    Glucose(HCN) Product (hydrolysis) Product (HI + Heat) A, the compound A is

  • 3)

    Among the following the achiral amino acid is

  • 4)

    In aqueous solution of amino acids mostly exists in,

  • 5)

    The pyrimidine bases present in DNA are

12th Standard Chemistry Biomolecules English Medium Free Online Test One Mark Questions 2020 - 2021 - by Saroja - Vellore - View & Read

  • 1)

    Which one of the following rotates the plane polarized light towards left?

  • 2)

    Assertion: A solution of sucrose in water is dextrorotatory. But on hydrolysis in the presence of little hydrochloric acid, it becomes levorotatory. (AIIMS)
    Reason: Sucrose hydrolysis gives unequal amounts of glucose and fructose. As a result of this change in sign of rotation is observed.

  • 3)

    In a protein, various amino acids liked together by

  • 4)

    The correct statement regarding RNA and DNA respectively is

  • 5)

    Vitamin B2 is also known as

12th Standard Chemistry Organic Nitrogen Compounds English Medium Free Online Test One Mark Questions 2020 - 2021 - by Saroja - Vellore - View & Read

  • 1)

    Which of the following reagent can be used to convert nitrobenzene to aniline

  • 2)

    Which one of the following will not undergo Hofmann bromamide reaction

  • 3)

    Aniline + benzoylchloride \(\overset { NaOH }{ \longrightarrow } \)C6H5 - NH - COC H this reaction is known as

  • 4)

    C6H5NO2 \(\overset { Fe/Hel }{ \longrightarrow } A\overset { { NaNO }_{ 2 }/HCl }{ \underset { 273K }{ \longrightarrow } } B\overset { { H }_{ 2 }O }{ \underset { 283 }{ \longrightarrow } } C\quad 'C'is\)

  • 5)

    Which of the following amines does not undergo acetylation?

12th Standard Chemistry Organic Nitrogen Compounds English Medium Free Online Test One Mark Questions with Answer Key 2020 - 2021 - by Saroja - Vellore - View & Read

  • 1)

    The method by which aniline cannot be prepared is

  • 2)

    When aniline reacts with acetic anhydride the product formed is

  • 3)

  • 4)

    Nitrobenzene on reaction with at 80-100oC forms which one of the following products?

  • 5)

    Secondary nitro alkanes react with nitrous acid to form

12th Standard Chemistry Carbonyl Compounds English Medium Free Online Test One Mark Questions with Answer Key 2020 - 2021 - by Saroja - Vellore - View & Read

  • 1)

    The formation of cyanohydrin from acetone is an example of

  • 2)

    Predict the product Z in the following series of reactions Ethanoic acid \(\overset { { PCI }_{ 5 } }{ \longrightarrow } X\overset { { C }_{ 6 }{ H }_{ 6 } }{ \underset { Anhydrous\quad AlcI }{ \longrightarrow } } Y\overset { 1){ CH }_{ 3 }MgBr }{ \underset { II){ H }_{ 3 }{ O }^{ + } }{ \longrightarrow } } Z.\)

  • 3)

    Which of the following represents the correct order of acidity in the given compounds

  • 4)

    The IUPAC name of 

  • 5)

    In which case chiral carbon is not generated by reaction with HCN

12th Standard Chemistry Carbonyl Compounds English Medium Free Online Test One Mark Questions 2020 - 2021 - by Saroja - Vellore - View & Read

  • 1)

    Reaction of acetone with one of the following reagents involves nucleophilic addition followed by elimination of water. The reagent is

  • 2)

    The correct structure of the product ‘A’ formed in the reaction

  • 3)

    \({ CH }_{ 2 }={ CH }_{ 2 }\overset { i){ O }_{ 3 } }{ \underset { zn/{ H }_{ 2 }O }{ \longrightarrow } } X\overset { { NH }_{ 3 } }{ \longrightarrow } Y\quad 'Y'\) is

  • 4)

    Assertion: 2,2 – dimethyl propanoic acid does not give HVZ reaction.
    Reason: 2 – 2, dimethyl propanoic acid does not have – - hydrogen atom

  • 5)

    Benzoic acid \(\overset { i){ NH }_{ 3 } }{ \underset { ii)\Delta }{ \longrightarrow } } A\overset { NaOBr }{ \longrightarrow } B\overset { NaN{ O }_{ 2 }/HCl }{ \longrightarrow } C\quad 'C'\quad is\)

12th Standard Chemistry Hydroxy Compounds and Ethers English Medium Free Online Test One Mark Questions with Answer Key 2020 - 2021 - by Saroja - Vellore - View & Read

  • 1)

    Which of the following compounds on reaction with methyl magnesium bromide will give tertiary alcohol.

  • 2)

    In the reaction sequence, Ethane \(\overset { HOCl }{ \longrightarrow } A\overset { x }{ \longrightarrow } \) ethan -1, 2 - diol . A and X respectively are

  • 3)

    on treatment with Con H2SO4, predominately gives

  • 4)

    Which one of the following will react with phenol to give salicyladehyde after hydrolysis.

  • 5)

    The correct IUPAC name of the compound, 

12th Standard Chemistry Ionic Equilibrium English Medium Free Online Test One Mark Questions with Answer Key 2020 - 2021 - by Saroja - Vellore - View & Read

  • 1)

    Following solutions were prepared by mixing different volumes of NAOH of HCL different concentrations
    1) 60 ML\(\frac{M}{10}\)HCL+40ML\(\frac{M}{10}\)NaOH
    2) 50 ML\(\frac{M}{10}\)HCL+45ML\(\frac{M}{10}\)NaOH
    3) 75ML\(\frac{M}{5}\)HCL+40ML\(\frac{M}{5}\)NaOH
    4) 100 ML\(\frac{M}{10}\)HCL+100ML\(\frac{M}{10}\)NaOH
    pH of which one of them will be equal to 1?

  • 2)

    pH of a saturated solution of Ca(OH)2 is 9. The Solubility product ( Ksp) of Ca(OH)2

  • 3)

    Which will make basic buffer?

  • 4)

    Which of these is not likely to act as lewis base?

  • 5)

    The aqueous solutions of sodium formate, anilinium chloride and potassium cyanide are respectively

12th Standard Chemistry Surface Chemistry English Medium Free Online Test One Mark Questions with Answer Key 2020 - 2021 - by Saroja - Vellore - View & Read

  • 1)

    Which of the following is incorrect for physisorption?

  • 2)

    Fog is colloidal solution 0 of

  • 3)

    Statement :
    To stop bleeding from an injury, ferric chloride can be applied. Which comment about the statement is justified?

  • 4)

    Which one of the is not a surfactant?

  • 5)

    Which one of the following is an example for homogeneous catalysis?

12th Standard Chemistry Hydroxy Compounds and Ethers English Medium Free Online Test One Mark Questions 2020 - 2021 - by Saroja - Vellore - View & Read

  • 1)

    An alcohol (x) gives blue colour in victormayer’s test and 3.7g of X when treated with metallic sodium liberates 560 mL of hydrogen at 273 K and 1 atm pressure what will be the possible structure of X?

  • 2)

    The X is

  • 3)

    Which one of the following is the strongest acid

  • 4)

    Carbolic acid is

  • 5)

    Assertion : Phenol is more acidic than ethanol
    Reason: Phenoxide ion is resonance stabilized

12th Standard Chemistry Surface Chemistry English Medium Free Online Test One Mark Questions 2020 - 2021 - by Saroja - Vellore - View & Read

  • 1)

    For freudlich isotherm a graph of log \(\frac{x}{m}\) is plotted against log P. The slope of the line and its y – axis intercept respectively corresponds to

  • 2)

    Which one of the following characteristics are associated with adsorption?

  • 3)

    Hair cream is

  • 4)

    The most effective electrolyte for the coagulation of AS2S3Sol is

  • 5)

    The phenomenon observed when a beam of light is passed through a colloidal solution is

12th Standard Chemistry Electro Chemistry English Medium Free Online Test One Mark Questions with Answer Key 2020 - 2021 - by Saroja - Vellore - View & Read

  • 1)

    Consider the following half cell reactions.
    Mn2+ + 2e− ➝ Mn Eo = -1.18V
    Mn2+ ➝Mn3+ e- Eo = -1.51V
    The Eo for the reaction 3Mn2+ ➝ Mn+2Mn3+ , and the possibility of the forward reaction are respectively

  • 2)

    Faradays constant is defined as

  • 3)

    The number of electrons delivered at the cathode during electrolysis by a current of 1A in 60 seconds is (charge of electron = 1.6 ×10−19C )

  • 4)

    While charging lead storage battery

  • 5)

    In H2-Ofuel cell the reaction occur at cathode is

12th Standard Chemistry Electro Chemistry English Medium Free Online Test One Mark Questions 2020 - 2021 - by Saroja - Vellore - View & Read

  • 1)

    The number of electrons that have a total charge of 9650 coulombs is

  • 2)

    The button cell used is watches function as follows
    Zn (s) + Ag2O (s) + H2O (l) ⇌ 2Ag (s) + Zn2+ (aq) + 2OH-(aq)the half cell potentials
    are Ag2 O (s) + H2O (l) + 2e- →2Ag (s) + 2OH- (aq) Eo.34V The cell potential will be

  • 3)
    Electrolyte KCl KNO3 HCl NaOAC NaCl
    Λ-
    (Scm2 mol-1)
    149.9 145.0 426.2 91.0 126.5

    Calculate ΛoHoAC using appropriate molar conductances of the electrolytes listed above at infinite dilution in water at 25oC.

  • 4)

    How many faradays of electricity are required for the following reaction to occur
    MnO→ Mn 4-

  • 5)

    During electrolysis of molten sodium chloride, the time required to produce 0.1mol of chlorine gas using a current of 3A is

12th Standard Chemistry Ionic Equilibrium English Medium Free Online Test One Mark Questions 2020 - 2021 - by Saroja - Vellore - View & Read

  • 1)

    Concentration of the Ag+ ions in a saturated solution of Ag2C2O4 is 2.24 ×10-4mol L-1 solubility product of Ag2C2O4 is

  • 2)

    Conjugate base for bronsted acids H2O and HF are

  • 3)

    Which of the following fluro – compounds is most likely to behave as a Lewis base?

  • 4)

    What is the decreasing order of strength of bases
    OH, NH2- H - C ≡ C and CH3 - CH2-

  • 5)

    The percentage of pyridine (C5H5N) that forms pyridinium ion (C5H5NH) in a 0.10M aqueous pyridine solution (Kb for C5H5N= 1.7×10-9) is

12th Standard Chemistry Chemical Kinetics English Medium Free Online Test One Mark Questions with Answer Key 2020 - 2021 - by Saroja - Vellore - View & Read

  • 1)

    A zero order reaction X ⟶ XProduct, with an initial concentration 0.02M has a half life of 10 min. if one starts with concentration 0.04M, then the half life is

  • 2)

    For a first order reaction A ⟶ product with initial concentration x mol L-1, has a half life period of 2.5 hours. For the same reaction with initial concentration \(\left( \frac { x }{ 2 } \right) \) mol L-1 the half life is

  • 3)

    The decomposition of phosphine (PH3) on tungsten at low pressure is a first order reaction. It is because the (NEET)

  • 4)

    The addition of a catalyst during a chemical reaction alters which of the following quantities? (NEET)

  • 5)

    In a reversible reaction, the enthalpy change and the activation energy in the forward direction are respectively −x kJ mol-4 and kJ mol-1 Therefore , the energy of activation in the backward direction is

12th Standard Chemistry Chemical Kinetics English Medium Free Online Test One Mark Questions 2020 - 2021 - by Saroja - Vellore - View & Read

  • 1)

    For a first order reaction A ⟶ B the rate constant is x min−1. If the initial concentration of A is 0.01M , the concentration of A after one hour is given by the expression.

  • 2)

    Among the following graphs showing variation of rate constant with temperature (T) for a reaction, the one that exhibits Arrhenius behavior over the entire temperature range is

  • 3)

    For a reaction Rate = kacetone[]32 then unit of rate constant and rate of reaction respectively is

  • 4)

    Consider the following statements :
    (i) increase in concentration of the reactant increases the rate of a zero order reaction.
    (ii) rate constant k is equal to collision frequency A if Ea = 0
    (iii) rate constant k is equal to collision frequency A if Ea =0
    (iv) a plot of ln (k) vs T is a straight line.
    (v) a plot of ln (k) vs \(\left( \cfrac { 1 }{ T } \right) \) is a straight line with a positive slope.
    Correct statements are

  • 5)

    What is the activation energy for a reaction if its rate doubles when the temperature is raised from 200K to 400K? (R = 8.314 JK-1mol-1)

12th Standard Chemistry Solid State English Medium Free Online Test One Mark Questions with Answer Key 2020 - 2021 - by Saroja - Vellore - View & Read

  • 1)

    An ionic compound AxBy crystallizes in fcc type crystal structure with B ions at the centre of each face and A ion occupying entre of the cube. the correct formula of AxBy is

  • 2)

    Solid CO2 is an example of

  • 3)

    The composition of a sample of wurtzite is FeO0.931.00 what % of Iron present in the form of Fe3+?

  • 4)

    CsCl has bcc arrangement, its unit cell edge length is 400pm, its inter atomic distance is

  • 5)

    The fraction of total volume occupied by the atoms in a simple cubic is

12th Standard Chemistry Solid State English Medium Free Online Test One Mark Questions 2020 - 2021 - by Saroja - Vellore - View & Read

  • 1)

    Graphite and diamond are

  • 2)

    The ratio of close packed atoms to tetrahedral hole in cubic packing is

  • 3)

    Assertion : monoclinic sulphur is an example of monoclinic crystal system
    Reason: for a monoclinic system, \(a\neq b\neq c\) and \(\alpha =\gamma ={ 90 }^{ 0 },\beta \neq { 90 }^{ 0 }\)

  • 4)

    The number of unit cells in 8 gm of an element X ( atomic mass 40) which crystallizes in bcc pattern is (NA is the Avogadro number)

  • 5)

    In a solid atom M occupies ccp lattice and \(\left( \cfrac { 1 }{ 3 } \right) \) of tetrahedral voids are occupied by atom N. find the formula of solid formed by M and N.

12th Standard Chemistry Coordination Chemistry English Medium Free Online Test One Mark Questions with Answer Key 2020 - 2021 - by Saroja - Vellore - View & Read

  • 1)

    An excess of silver nitrate is added to 100ml of a 0.01M solution of pentaaquachloridochromium(III)chloride. The number of moles of AgCl precipitated would be

  • 2)

    IUPAC name of the complex K3[Al(C2O4)3] is 

  • 3)

    Crystal field stabilization energy for high spin d5 octahedral complex is

  • 4)

    Which one of the following will give a pair of enantiomorphs?

  • 5)

    How many geometrical isomers are possible for<<EVA035.eps>>?

12th Standard Chemistry Coordination Chemistry English Medium Free Online Test One Mark Questions 2020 - 2021 - by Saroja - Vellore - View & Read

  • 1)

    The sum of primary valence and secondary valence of the metal M in the complex [M(en)2(Ox)]Cl isL

  • 2)

    As per IUPAC guidelines, the name of the complex [Co(en)2(ONO)Cl]Cl is

  • 3)

    A magnetic moment of 1.73BM will be shown by one among the following (NEET)

  • 4)

    In which of the following coordination entities the magnitude of Δ0 will be maximum?

  • 5)

    Which type of isomerism is exhibited by [Pt(NH3)2Cl2]?

12th Standard Chemistry Transition and Inner Transition Elements English Medium Free Online Test One Mark Questions with Answer Key 2020 - 2021 - by Saroja - Vellore - View & Read

  • 1)

    Which of the following d block element has half filled penultimate d sub shell as well as half filled valence sub shell?

  • 2)

    Which of the following compounds is colourless?

  • 3)

    The correct order of increasing oxidizing power in the series

  • 4)

    Which of the following does not give oxygen on heating?

  • 5)

    Which of the following statements is not true?

12th Standard Chemistry Transition and Inner Transition Elements English Medium Free Online Test One Mark Questions 2020 - 2021 - by Saroja - Vellore - View & Read

  • 1)

    Sc( Z=21) is a transition element but Zinc (z=30) is not becaus

  • 2)

    Among the transition metals of 3d series, the one that has highest negative \(\left( \frac { M^{ 2+ } }{ M } \right) \) standard electrode potential is

  • 3)

    The magnetic moment of Mn2+ ion is

  • 4)

    the catalytic behaviour of transition metals and their compounds is ascribed mainly due to

  • 5)

    The alloy of copper that contain Zinc is

12th Standard Chemistry p Block Elements II English Medium Free Online Test One Mark Questions with Answer Key 2020 - 2021 - by Saroja - Vellore - View & Read

  • 1)

    Which is true regarding nitrogen?

  • 2)

    Solid (A) reacts with strong aqueous NaOH liberating a foul smelling gas(B) which spontaneously burn in air giving smoky rings. A and B are respectively

  • 3)

    On hydrolysis, PCl3 gives

  • 4)

    The basicity of pyrophosphorous acid ( H4P2O5) is

  • 5)

    Assertion : bond dissociation energy of fluorine is greater than chlorine gas
    Reason: chlorine has more electronic repulsion than fluorine.

View all

TN Stateboard Education Study Materials

TN Stateboard Updated Class 12th Chemistry Syllabus

Metallurgy

Introduction - Occurrence of metals - Concentration of ores - Extraction of crude metal - Thermodynamic principle of metallurgy - Electrochemical principle of metallurgy - Refining process - Application metals - 

p - Block Elements - I

Introduction - General trends in properties of p-block elements - Group 13 (Boron group) elements - Group 14 (Carbon group) elements - 

p - Block Elements - II

Introduction - Group 15 (Nitrogen group) elements - oxygen - Group 17 (Halogen group) elements - Group 18 (Inert gases) elements - 

Transition and Inner Transition Elements

Introduction - Position of d- block elements in the periodic table - Electronic configuration - General trend in properties - important compound of Transition elements

Coordination Chemistry

Introduction - Coordination compounds and double salts - Werner's theory of coordination compounds - Definition of important terms pertaining to co-ordination compounds - Nomenclature of coordination compounds - Isomerism in coordination compounds - Theories of coordination compound

Solid State

Introduction - General characteristics of solids - Classification of solids - Classification of crystalline solids - Classification of crystalline solids - Primitive and non-primitive unit cell - Packing in crystals - Imperfection in solids

Chemical Kinetics

Introduction - Rate of a chemical reaction - Molecularity - The integrated rate equation - Half-life period of a reaction - Collision theory - Arrhenius equation – The effect of temperature on reaction rate - Factors affecting the reaction rate

TN StateboardStudy Material - Sample Question Papers with Solutions for Class 12 Session 2019 - 2020

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