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Important 1 Mark Creative Questions (New Syllabus) 2020

12th Standard EM

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Chemistry

Time : 00:40:00 Hrs
Total Marks : 90

    Part A

    90 x 1 = 90
  1. Which of the following is incorrect with respect to metallurgy of iron in the blast furnace?

    (a)

    Zone of combustion : \(C+{ O }_{ 2 }\rightarrow { CO }_{ 2 }\)

    (b)

    Zone of heat absorption : \({ CO }_{ 2 }\rightarrow C+{ O }_{ 2 }\)

    (c)

    Zone of slag formation : \(CaO+{ SiO }_{ 2 }\rightarrow CaSiO_{ 3 }\)

    (d)

    Zone of reduction : \({ Fe }_{ 2 }{ O }_{ 3 }3C\rightarrow 3CO+2Fe\)

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

    (a)

    Non-wettability of the mineral particles in froth.

    (b)

    Non-wettability of the mineral particles in water

    (c)

    Non-wettability of the gangue particles in froth

    (d)

    Non-wettability of the gangue particles in water

  3. \(2PbS+{ 3O }_{ 2 }\longrightarrow 2pbO+{ 2SO }_{ 2 }\) Name the process

    (a)

    Roasting

    (b)

    Calcination

    (c)

    Smelting

    (d)

    Leaching

  4. Malachite has______ composition.

    (a)

    2CuCO3.Cu(OH)2

    (b)

    2CuCO3.Cu(OH)2

    (c)

    Cu2O

    (d)

    Cu2S

  5. Galena is_________

    (a)

    PbS

    (b)

    ZnS

    (c)

    Ag2S

    (d)

    FeS2

  6. In graphite electrons are

    (a)

    localised on each C-atom

    (b)

    localised on every third C-atom

    (c)

    delocalised within the layer

    (d)

    present in anti-bonding orbital

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

    (a)

    due to presence of vacant d-orbitals

    (b)

    due to absence of vacant d-orbitals

    (c)

    due to presence of partially filled d-orbitals

    (d)

    due to presence of completely filled d-orbitals

  8. Which is dibasic?

    (a)

    Orthophosphoric acid

    (b)

    Pyrophosphoric acid

    (c)

    Orthophosphorus acid

    (d)

    Hypophosphorus acid

  9. Which one of the following orders is not in accordance with the property stated against it?

    (a)

    F2> CI2> Br2> I2:Bond dissociation energy

    (b)

    HI > HBr> HCI > HF : Acidic property in water

    (c)

    F2> Cl2> Br2> l2: Oxidising power

    (d)

    F2> Cl2> Br2> l2: Electronegativity

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

    (a)

    incombustible

    (b)

    radioactive and detected easily

    (c)

    lighter than hydrogen

    (d)

    both (a) and(c)

  11. Oxygen stabilises higher oxidation state because

    (a)

    it is electronegative

    (b)

    of its tendency to form multiple bond

    (c)

    of large size

    (d)

    of small size

  12. Which of the following is not coloured?

    (a)

    Mn2+

    (b)

    Zn2+

    (c)

    Cr3+

    (d)

    Cu2+

  13. On oxidation with KMnO4 in acidic medium, SO2 is oxidised to ___________

    (a)

    SO2

    (b)

    H2SO4

    (c)

    SO32-

    (d)

    H2S

  14. If the standard electrode potential (Eo) of a inetal is ____________ and ______________ the metal is a powerful reducing agent.

    (a)

    large, negative

    (b)

    large, positive

    (c)

    small, negative

    (d)

    small, positive

  15. Which of the following octahedral complexes do not show geometrical isomerism?

    (a)

    [Co(NH3)3Cl3]

    (b)

    [PtCl2(NH3)4]

    (c)

    [Pt(NH3)2Cl2]

    (d)

    [Co(en)3]3+

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

    (a)

    [Co(NH3)3(H2O)2Cl]Cl2

    (b)

    [Co(NH)3(H2O)Cl3]

    (c)

    [Co(NH2)3(H2O)2Cl]

    (d)

    [Co(NH3)3(H2O)3]Cl3

  17. The type of isomerism found in the complexes [Co(NO2)(NH3)5]SO4 and [Co(SO4)(NH3)5] NO2

    (a)

    Hydrate isomerism

    (b)

    Coordination isomerism

    (c)

    Linkage isomerism

    (d)

    Ionisation

  18. The coordination polyhedron of the complex [Cr(H2O)6]CI3 is____________

    (a)

    square planar

    (b)

    tetrahedral

    (c)

    trigonal

    (d)

    octahedral

  19. The ambidentate ligands are ____________

    (a)

    SCN- and NCS

    (b)

    NO2- and ONO

    (c)

    both (a) and (b)

    (d)

    None

  20. Magnetic moment is given by the formula

    (a)

    \(\sqrt { n(n+1) } \)

    (b)

    \(\sqrt { n(n+2) } \)

    (c)

    \(\sqrt { (n+2) } \)

    (d)

    \(\sqrt { { n }^{ 2 }+(n+2) } \)

  21. A solid with formula ABC3 would probably have,

    (a)

    A at body centre, B at face centres and C at corners of the cube

    (b)

    A at corners of cube, B at body centre, C at face centre

    (c)

    A at corners of hexagon, B at centres of the hexagon and C inside the hexagonal unit cell

    (d)

    A at corner, B at face centre, C at body centre

  22. Calculate the number of atoms in a cubic unit cell having one atom on each corner and one atom on each body diagonal

    (a)

    2

    (b)

    3

    (c)

    4

    (d)

    5

  23. The defect arising due to an ion occupying interstitial position is called

    (a)

    Schottky defect

    (b)

    Metal excess defect

    (c)

    Frenkel defect

    (d)

    Metal deficiency defect

  24. The total number of elements of symmetry in a cubic crystal is________.

    (a)

    9

    (b)

    23

    (c)

    10

    (d)

    14

  25. The Bragg's equation is _______

    (a)

    λ.= 2d sinθ

    (b)

    nd = 2λ sinθ

    (c)

    2λ= nd sinθ

    (d)

    nλ= 2d sinθ

  26. Which of the following does not affect the rate of reaction?

    (a)

    Amount of the reactant taken

    (b)

    Physical state of the reactant

    (c)

    ∆H of reaction

    (d)

    Size of vessel

  27. The addition of a catalyst during a chemical reaction alters which of the following quantities?

    (a)

    Activation energy

    (b)

    Entropy

    (c)

    Internal energy

    (d)

    Enthalpy

  28. Pick out the odd one.
     

    (a)

     92U238 ⟶ 90Th234 + 2He4

    (b)

    SO2 Cl2 ⟶ SO2 + Cl2

    (c)

    CH3 COOCH3 + H2\(\overset { { H }^{ + } }{ \longrightarrow } \) CH3 COOH + CH3 OH

    (d)

    C12 H22 O11 + H2\(\overset { { H }^{ + } }{ \longrightarrow } \) C6 H12 O6 + C6 H12 O6

  29. CH3COOCH3 + H2 OH \(\overset { { H }^{ + } }{ \longrightarrow } \) CH3 COOH + CH3 OH is an example of ____________ order reaction.

    (a)

    first

    (b)

    zero

    (c)

    third

    (d)

    pseudo

  30. For a reaction, Ea = 0 and k = 4.2 x l05 sec-1 at 300 K, the value of kat 310 Kwill be ______________

    (a)

    4.2 x 105 sec-1

    (b)

    8.4 x 105 sec-1

    (c)

    8.4 x 105 sec-1

    (d)

    unpredictable 

  31. Pick the strongest conjugate base among the following

    (a)

    Cl-

    (b)

    \({ NO }_{ 2 }^{ - }\)

    (c)

    \({ SO }_{ 4 }^{ 2- }\)

    (d)

    CH3COO-

  32. Which among the following has the highest pH?

    (a)

    1M NH4 OH

    (b)

    1M HCI

    (c)

    1M NaOH

    (d)

    0.1 M NaOH

  33.  Which among the following is incorrect regarding acids?

    (a)

    It produces H+ ions in aqueous solution

    (b)

    It can donate a proton to another substance

    (c)

    It can accept a proton from another substance

    (d)

    It accepts a pair of electrons

  34. When 10-6 mole of a monobasic strong acid is dissolved in one litre of solvent, the pH of the solution is

    (a)

    6

    (b)

    7

    (c)

    less than 6

    (d)

    more than 7

  35. If ionic product < solubility product then the solution is ________

    (a)

    saturated

    (b)

    super saturated

    (c)

    unsaturated

    (d)

    none of the above

  36. A device in which spontaneous chemical reaction generates electric current.

    (a)

    Galvanic cell

    (b)

    Voltaic cell

    (c)

    Daniel cell

    (d)

    All the above

  37. For the given cell
    Cr(s)|Cr3+(aq)||Cu2+(aq)|Cu(s) which is correct?

    (a)

    Cr is the anode

    (b)

    Cu is the anode

    (c)

    Overall cell reaction is
    2Cr3+(aq) +3Cu(s) ⟶ 2Cr(s) + 3Cu2+(aq) 

    (d)

    Cu is the anode and Overall cell reaction is
    2Cr3+(aq) +3Cu(s) ⟶ 2Cr(s) + 3Cu2+(aq) 

  38. According to Faraday's first law m = ZIt, where Z is

    (a)

    reaction quotient

    (b)

    effective nuclear charge

    (c)

    atomic number

    (d)

    electrochemical equivalent

  39. The potential of a single electrode is a half cell is called the

    (a)

    Reduction potential

    (b)

    Half-wave potentialSingleelectrode potential

    (c)

    Singleelectrode potential

    (d)

    Cell potential

  40. What is/are the factor(s) that govern the single electrode potential of a half cell?

    (a)

    concentration of ions in solution

    (b)

    tendency to form ions

    (c)

    temperature

    (d)

    all of these

  41. Unit of resistivity is ___________

    (a)

    ohm metre

    (b)

    siemen

    (c)

    sm-1

    (d)

    mho

  42. The cathode in Leclanche cell is ______________

    (a)

    Zinc container

    (b)

    Spongy lead

    (c)

    Graphite rod in contact with MnO2

    (d)

    HgO mixed with graphite

  43. Metals at the top of the electrochemical series are _______

    (a)

    strong hydrating agents

    (b)

    strong dehydrating agents

    (c)

    strong reducing agents

    (d)

    strong oxidising agents

  44. The cell potential Ecell is __________

    (a)

    Eocell = Eocathode - Eoanode

    (b)

    Eocell = Eoanode - Eocathode

    (c)

    Ecell = Ecell- 0.0591 log K

    (d)

    Ecell = Ecell - \(\frac{0.0591}{n}\) log k 

  45. 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.

    (a)

    only (ii)

    (b)

    (ii) and (iii)

    (c)

    only (i)

    (d)

    (i) and (iv)

  46. Auto catalysis is observed in the reaction given below.
    CH3COOC2H5+H2O➝ CH3COOH+C2H5OH

    (a)

    CH3COOC2H5

    (b)

    H2O

    (c)

    CH3COOH

    (d)

    C2H5OH

  47. Colloidal solution of ink is prepared by

    (a)

    mechanical dispersion

    (b)

    electro dispersion

    (c)

    ultrasonic dispersion

    (d)

    peptisation

  48. A colloidal system in which the dispersed phase has very little affinity for the dispersion medium is called

    (a)

    lyophilic

    (b)

    lyophobic

    (c)

    solid

    (d)

    aerosol

  49. A substance which destroys the activity of a catalyst is________

    (a)

    negative catalyst

    (b)

    catalytic poison

    (c)

    both (a) and (b)

    (d)

    promoter

  50. An example of lyophilic colloid is__________

    (a)

    sulphur in water

    (b)

    phosphorus in water

    (c)

    starch

    (d)

    all of these

  51. Which among the following reagent is not used to differentiate ethanol and phenol?

    (a)

    neutral FeCl3

    (b)

    C6H5N2CI

    (c)

    NaOH

    (d)

    anhy ZnCl2

  52. Ethyl alcohol cannot be used as a solvent for CH3MgI because

    (a)

    CH3MgI reacts with alcohol giving methane

    (b)

    the reaction between them is explosive in natrue

    (c)

    CH3MgI is converted to C2H5MgI

    (d)

    alcohol is immiscible with CH3MgI

  53. Predict the structure of propane-1,2 diol

    (a)

    CH2 (OH) - CH2CH2OH

    (b)

    HOCH2 - CH2OH

    (c)

    CH3CH (OH) CH2OH

    (d)

    None of these

  54. Lucas test is used to distinguish 10, 20 and 30 

    (a)

    amines

    (b)

    nitro compound

    (c)

    alcohols

    (d)

    all the above

  55. 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.

    (a)

    benzaldelyde and benzoic acid

    (b)

    Methyl phenykarbinol and acetophenone

    (c)

    benzyl alcohol and benzaldehyde

    (d)

    diphenyl carbinol and benzophenone

  56. The compound that acts as a solvent for Grignard reagent is :

    (a)

    Ethyl alcohol

    (b)

    Diethyl ether

    (c)

    Acetone

    (d)

    Benzene

  57. The common name of this compound CH2 =CH-CH-OH is ______

    (a)

    glycerol

    (b)

    vinyl alcohol

    (c)

    allyl alcohol

    (d)

    prop-2-en-l-ol

  58. CH3CH2OH \(\underset { (O) }{ \longrightarrow } \) CH3CHO  \(\underset { (O) }{ \longrightarrow } \) CH3COOH To stop the oxidation reaction at the aldehyde stage, ______ is used as an oxidising agent.

    (a)

    KMnO4 | H+

    (b)

    K2Cr2O7 | H+

    (c)

    pyridinium chloro chromate

    (d)

    both (a) and (b)

  59. Picric acid is __________

    (a)

    2,4,6 trinitro toluene

    (b)

    2,4,6 trinitro benzaldehyde

    (c)

    2,4,6 trinitro phenol

    (d)

    2,4,6 trinitro benzoic acid

  60. On oxidation of an alcohol gives an aldehyde having the same number of cabon atoms as that of alcohol is ________

    (a)

    10 alcohol

    (b)

    20 alcohol

    (c)

    30 alcohol

    (d)

    None

  61. The acitve component of dynamite is _______

    (a)

    keiselghur

    (b)

    nitro glycerine

    (c)

    nitro benzene

    (d)

    trinitro toluene

  62. An example of trihydric alcohol is _________

    (a)

    trimethyl carbinol

    (b)

    3-hexanol

    (c)

    propane-1,2,3-triol

    (d)

    tert-butylacohol

  63. Phenol turns _______ when air oxidised.

    (a)

    red

    (b)

    violet

    (c)

    blue

    (d)

    green

  64. Oxidation of glycerol with bismuth nitrate gives ________

    (a)

    meso-oxalic acid

    (b)

    glyceric acid

    (c)

    tartronic acid

    (d)

    both (b) and (c)

  65. On heating, peroxides are ________

    (a)

    stable

    (b)

    unstable

    (c)

    decomposes violently

    (d)

    both (b) and (c)

  66. Which among the carbonyl compounds cannot be prepared by Rosenmund reduction?

    (a)

    Ketones

    (b)

    Formaldehyde

    (c)

    Acetaldehyde

    (d)

    Both (a) and (b)

  67. From which of the following, tertiary butyl alcohol is obtained by the action of methyl magnesium iodide?

    (a)

    HCHO

    (b)

    CH3CHO

    (c)

    CH3COCH3

    (d)

    CO2

  68. Which of the following does not give iodoform test?

    (a)

    aceto phenone

    (b)

    benzophenone

    (c)

    \({ CH }_{ 3 }-\underset { \overset { | }{ { CH }_{ 3 } } }{ CHOH } \)

    (d)

    \({ CH }_{ 3 }-\underset { \overset { | }{ OH } }{ CH } -{ { CH }_{ 2 }{ CH }_{ 2 }-CH }_{ 3 }\)

  69. Chloretone is an addition product of

    (a)

    CH3CHO, HCHP

    (b)

    CH3CHO,CHCl3

    (c)

    \({ CH }_{ 3 }-\underset { \overset { || }{ O } }{ C } -{ CH }_{ 3 },{ CCl }_{ 4 }\)

    (d)

    \(\\ { CH }_{ 3 }-\underset { \overset { || }{ O } }{ C } -{ CH }_{ 3 },{ CHCl }_{ 4 }\)

  70. Aldehydes are functional isomers of

    (a)

    ethers

    (b)

    alcohols

    (c)

    ketones

    (d)

    esters

  71. Which of the following is least acidic

    (a)

    C2H5OH

    (b)

    CH3COOH

    (c)

    C6H5OH

    (d)

    ClCH2COOH

  72. Acids have higher boiling points due to

    (a)

    pleasant smell

    (b)

    waxy solid

    (c)

    hydrogen bonding

    (d)

    - COOH group

  73. The high boiling points of carboxylic acids is due to

    (a)

    weak Vanderwaal's forces

    (b)

    intermolecular hydrogen bonding

    (c)

    intramolecular hydrogen bonding.

    (d)

    delocalisation of π electrons

  74. Reduction of ketone gives _______.

    (a)

    Primary alcohol

    (b)

    Secondary alcohol

    (c)

    Primary amide

    (d)

    Secondary amide

  75. Partial reduction of acetic acid in the presence of LiAl H4 results in the formation of ________.

    (a)

    ethane

    (b)

    ethanol

    (c)

    ethene

    (d)

    ethyne

  76. The most acidic among the following is ________.

    (a)

    p- nitrophenol

    (b)

    p- hydroxybenzoicacid

    (c)

    o- hydroxy benzoic acid

    (d)

    p- toluic acid

  77. Aldehydes and ketones are reduced to hydrocarbons by zinc amalgam and cone.HCI. This is__________ reaction.

    (a)

    Clemmenson's reduction

    (b)

    Wolff krishner reduction

    (c)

    Rosenmmunds reduction

    (d)

    catalytic reduction

  78. Tollen's reagent is ________.

    (a)

    ammoniacal cuprous chloride

    (b)

    ammoniacal cuprous oxide

    (c)

    ammoniacal silver nitrate

    (d)

    ammoniacal silver chloride

  79. (CH3)2 - CH - NO when boiled with HCI/H2O gives compound 'X'. Identify 'X'.

    (a)

    CH3COOH

    (b)

    (CH3)2C = 0

    (c)

    CH3CHO

    (d)

    CH3NO2

  80. When nitromethane is reduced with Zn dust + NH4 CI in neutral medium, we get

    (a)

    CH3NH2

    (b)

    C2H5NH2

    (c)

    CH3NHOH

    (d)

    C2H5COOH

  81. The test for aniline is

    (a)

    Fehling's test

    (b)

    Ferric chloride test

    (c)

    Bromination test

    (d)

    Riemer Tiemann test

  82. Which among the following is a tertiary amine?

    (a)

    (CH3)3-C-NH2

    (b)

    \({ CH }_{ 3 }-\underset { \overset { | }{ { CH }_{ 3 } } }{ CH } -{ NH }-{ CH }_{ 3 }\)

    (c)

    (CH3)2-N-C2H5

    (d)

    \({ CH }_{ 2 }-\overset { \underset { | }{ { CH }_{ 3 } } }{ \underset { \overset { | }{ { NH }_{ 2 } } }{ C } } -C_{ 2 }{ H }_{ 3 }\)

  83. Oxidation of aniline with acidified K2Cr2O7 gives ___________

    (a)

    p-benzoquinone

    (b)

    benzoic acid

    (c)

    benzaldehyde

    (d)

    benzyl alcohol

  84. Two amino acids say A, B react to give

    (a)

    two dipeptides

    (b)

    three dipeptides

    (c)

    four dipeptides

    (d)

    only one

  85. Sugars that yield two to ten monosaccharide molecules on hydrolysis is

    (a)

    monosaccharides

    (b)

    disaccharides

    (c)

    oligosaccharides

    (d)

    polysaccharides

  86. Glucose+aceticanhydrid \(\overset { pyridine }{ \longrightarrow } ?\)

    (a)

    di acetate

    (b)

    tetra acetate

    (c)

    penta acetate

    (d)

    hexa acetate

  87. Pyridoxine is__________

    (a)

    vitamin B6

    (b)

    vitamin B7

    (c)

    vitamin B9

    (d)

    vitamin B5

  88. Proteins are found to have two different type of secondary structures, a-helix and P pleated sheet structure a-helix structure of protein is stabilised by_________

    (a)

    peptide bond

    (b)

    vander Waalsforces

    (c)

    hydrogenbonds

    (d)

    dipole - dipole interaction

  89. Which one of the following is employed as antihistamine?

    (a)

    azithromycin

    (b)

    ciprofloxacin

    (c)

    cetirizine

    (d)

    neomycin

  90. Addition polymerisation is also called as _______ polymerisation.

    (a)

    chain growth

    (b)

    condensation

    (c)

    step growth

    (d)

    none of the above

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