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All Chapter 1 Marks

12th Standard EM

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Chemistry

Time : 01:00:00 Hrs
Total Marks : 60
    Choose the Correct Answer: 
    60 x 1 = 60
  1. Which one of the following reaction represents calcinations?

    (a)

    \(2Zn+{ O }_{ 2 }\rightarrow 2ZnO\)

    (b)

    \(2ZnS+3O_{ 2 }\rightarrow 2ZnS+3O_{ 2 }\rightarrow 2ZnO_{ 2 }\rightarrow 2ZnO+2SO_{ 2 }\)

    (c)

    \(MgCO_{ 3 }\rightarrow MgO+CO_{ 2 }\)

    (d)

    Both (a) and (c)

  2. In the Ellingham diagram, for the formation of carbon monoxide

    (a)

    \(\left( \cfrac { \Delta { S }^{ 0 } }{ \Delta T } \right) \)

    (b)

    \(\left( \cfrac { \Delta { G }^{ 0 } }{ \Delta T } \right) \) is positive

    (c)

    \(\left( \cfrac { \Delta { G }^{ 0 } }{ \Delta T } \right) \) is negative

    (d)

    initially \(\left( \cfrac { \Delta T }{ \Delta { G }^{ 0 } } \right) \) is positive, after 700oC,\(\left( \cfrac { \Delta { G }^{ 0 } }{ \Delta T } \right) \) is negative

  3. Malachite has______ composition.

    (a)

    2CuCO3.Cu(OH)2

    (b)

    2CuCO3.Cu(OH)2

    (c)

    Cu2O

    (d)

    Cu2S

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

    (a)

    magnetic properties

    (b)

    chemical properties

    (c)

    physical properties

    (d)

    melting point

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

    (a)

    Carbon

    (b)

    silicon

    (c)

    Lead

    (d)

    germanium

  6. The stability of +1 oxidation state increases in the sequence

    (a)

    Al < Ga < In < Tl

    (b)

    Tl < In < Ga < Al

    (c)

    In < Tl < Ga < Al

    (d)

    Ga< In < Al < Tl

  7. Which one of the following compounds has similar structure to that of graphite?

    (a)

    Boron nitride

    (b)

    Boron Carbide

    (c)

    Aluminium Carbide

    (d)

    Aluminium Oxide

  8. Borax is _______

    (a)

    Na2[B4O5(OH)4).8H2O

    (b)

    Na2[B4O5(OH)6).7H2O

    (c)

    Na2[B4O3(OH)8].6H2O

    (d)

    Na2[B4O2(OH)10).5H2O

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

    (a)

    a mixture of No and NO2

    (b)

    Nitroso ferrous sulphate

    (c)

    Ferrous nitrate

    (d)

    Ferric nitra

  10. Which of the following is strongest acid among all?

    (a)

    HI

    (b)

    HF

    (c)

    HBr

    (d)

    HCl

  11. Catenation property of group 15 elements, follow the order

    (a)

    N < P < As < Sb < Bi

    (b)

    P >> N > As > Sb > Bi

    (c)

    P < N < As < Sb < Bi

    (d)

    N>> P > As > Sb > Bi

  12. Which reaction is not feasible__________

    (a)

    \({ 2H }_{ 2 }O+{ 2F }_{ 2 }\longrightarrow 4HF+{ O }_{ 2 }\)

    (b)

    \({ 2H }_{ 2 }O+{ 2F }_{ 2 }\longrightarrow 4HF+{ O }_{ 2 }\)

    (c)

    \(2KBr+{ Cl }_{ 2 }\longrightarrow 2KCl+{ Br }_{ 2 }\)

    (d)

    \(2KBr+{ Cl }_{ 2 }\longrightarrow 2KCl+{ Br }_{ 2 }\)

  13. Which of the following does not give oxygen on heating?

    (a)

    K2Cr2O7

    (b)

    (NH4)2Cr2O7

    (c)

    KClO3

    (d)

    Zn(ClO3)2

  14. MnO4- react with Br- in alkaline PH to give

    (a)

    BrO3- MnO2

    (b)

    Br2, MnO42-

    (c)

    Br2, MnO2

    (d)

    BrO-, MnO42-

  15. The reaction of aqueous KMnO4 with H2O2 in acidic condition gives

    (a)

    Mn4+ and MnO2

    (b)

    Mn4+ and O2

    (c)

    Mn2+ and O2

    (d)

    Mn2+ and O3

  16. Sometimes vessels made of copper or bronze show traces of green colour. This is due to the formation of ___________________

    (a)

    Cu(OH)2

    (b)

    CuCO3

    (c)

    Cu(OH)2CuCO3

    (d)

    Cu(OH)2CuSO4

  17. 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?

    (a)

    [M(H2O)4Cl]SO42H2O

    (b)

    [M(H2O)6]SO4

    (c)

    [M(H2O)5Cl]SO4H2O

    (d)

    [M(H2O)3Cl]SO4.3H2O

  18. Choose the correct statement

    (a)

    Square planar complexes are more stable than octahedral complexes

    (b)

    The spin only magnetic moment of [Cu(Cl)4]2- is BM and it has square planar structure.

    (c)

    Crystal field splitting energy \(\left( { \Delta }_{ 0 } \right) \) [FeF6]4- is higher than the \((\Delta _{ 0 })\) \([Fe(CN)6]{ { 4 }^{ - } }\) 

    (d)

    crystal field stabilization energy of [V(H2O)6]2+ is higher than the crystal field stabilization of [Ti(H2O)6]2+

  19. 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

  20. According to IUPAC, No is ______________

    (a)

    nitro

    (b)

    nitrosyl

    (c)

    nitrato

    (d)

    nitrito

  21. Graphite and diamond are

    (a)

    Covalent and molecular crystals

    (b)

    ionic and covalent crystals

    (c)

    both covalent crystals

    (d)

    both molecular crystals

  22. In calcium fluoride, having the flurite structure the coordination number of Ca2+ ion and F- Ion are (NEET)

    (a)

    4 and 2

    (b)

    6 and 6

    (c)

    8 and 4

    (d)

    4 and 8

  23. In the Bragg's equation for diffraction of X-rays, 'n' represents

    (a)

    The number of moles

    (b)

    Avogadro number

    (c)

    A quantum number

    (d)

    Order of reflection

  24. The site labelled as 'X' in FCC arrangement is________

    (a)

    Face with 1/4 contribution

    (b)

    Edge with 1/4 contribution

    (c)

    Corner with 1/4 contribution

    (d)

    Tetrahedral void with 1/8 contribution

  25. 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

    (a)

    (2.5 x 2) hours

    (b)

    \(\left( \frac { 2.5 }{ 2 } \right) \)hours

    (c)

    2.5 hours

    (d)

    Without knowing the rate constant, t1/2 cannot be determined from the given data

  26. The rate constant of a reaction is 5.8X10-2. The order of the reaction is

    (a)

    First order

    (b)

    zero order

    (c)

    Second order

    (d)

    Third order

  27. Concentration is expressed in?

    (a)

    \(\frac { number\ of\ moles/litre }{ time\ in\ sec } \)

    (b)

    \(\frac { time\ in\ sec }{ number\ of\ moles/litre } \)

    (c)

    \(\frac { number\ of\ moles/litre }{ volume } \)

    (d)

    \(\frac { volume }{ number\ of\ moles/litre } \)

  28. For the second order reaction \({ t }_{ \frac { 1 }{ 2 } }\alpha \)

    (a)

    \(\frac { 1 }{ { a }^{ 2 } } \)

    (b)

    \(\frac { 1 }{ { a } } \)

    (c)

    Constant

    (d)

    a

  29. Using Gibb’s free energy change, ∆Go=57.34 kJ mol-1, for the reaction, X2Y(s)⇌2X++Y2- (aq), calculate the solubility product of X2Y in water at 300 K (R = 8.3 J K-1Mol-1)

    (a)

    10-10

    (b)

    10-12

    (c)

    10-14

    (d)

    can not be calculated from the given dat

  30. Which of the following can act as lowery – Bronsted acid well as base?

    (a)

    HCl

    (b)

    SO42−

    (c)

    HPO42−

    (d)

    Br-

  31. 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

  32. The degree of hydrolysis of 0.1 M solution of ammonium acetate is 8.48 x 10-5. The dissociation constant of the weak base is

    (a)

    1.39 x 10-4

    (b)

    1.39 X 10-5

    (c)

    1.45 X 10-10

    (d)

    1.45 X 10-9

  33. 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

    (a)

    0.84V

    (b)

    1.34V

    (c)

    1.10V

    (d)

    0.42V

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

    (a)

    Zinc is lighter than iron

    (b)

    Zinc has lower melting point than iron

    (c)

    Zinc has lower negative electrode potential than iron

    (d)

    Zinc has higher negative electrode potential than iron

  35. Which among the following has same equivalent and molar conductance

    (a)

    H2SO4

    (b)

    CH3COOH

    (c)

    NaCI

    (d)

    Na2SO4

  36. In the cell representation (+) represents

    (a)

    salt bridge

    (b)

    phase boundary

    (c)

    cathode

    (d)

    anode

  37. Fog is colloidal solution 0 of

    (a)

    solid in gas

    (b)

    gas in gas

    (c)

    liquid in gas

    (d)

    gas in liquid

  38. The most effective electrolyte for the coagulation of AS2S3Sol is

    (a)

    NaCl

    (b)

    Ba(NO3)2

    (c)

    K3[Fe(CN)6]

    (d)

    Al3+

  39. The phenomenon of scattering of light by the sol particles is called

    (a)

    tyndall effect

    (b)

    electrophoresis

    (c)

    cataphoresis

    (d)

    dialysis

  40. An example of Gel is_______

    (a)

    sharing cream

    (b)

    paints

    (c)

    butter

    (d)

    whippedcream

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

    (a)

    benzaldehyde

    (b)

    propanoic acid

    (c)

    methyl propanoate

    (d)

    acetaldehyde

  42. On reacting with neutral ferric chloride, phenol gives

    (a)

    red colour

    (b)

    violet colour

    (c)

    dark green colour

    (d)

    no colouration.

  43. p-Nitrophenol is having lower pKa value than phenol because

    (a)

    phenol is more acidic than p-nitro phenol

    (b)

    anion of P-nitro phenol is more stabilised by resonance than that of phenol.

    (c)

    degree of ionisation of p-nitro phenol is less than that of phenol

    (d)

    anion of p-nitro phenol is less stable than that of phenol.

  44. 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)

  45. Ethanoic acid \(\overset { P/{ Br }_{ 2 } }{ \longrightarrow . } \)2-bromoethanoic acid. This reaction is called

    (a)

    Finkelstein reaction

    (b)

    Haloform reaction

    (c)

    Hell – Volhard – Zelinsky reaction

    (d)

    none of these

  46. The reagent used to distinguish between acetaldehyde and benzaldehyde is

    (a)

    Tollens reagent

    (b)

    Fehling’s solution

    (c)

    2,4 – dinitrophenyl hydrazine

    (d)

    semicarbazide

  47. Isopropyl alcohol vapours with air over silver catalyst at 520 K give

    (a)

    tert.butyl alcohol

    (b)

    acetaldehyde

    (c)

    acetone

    (d)

    2-propanol

  48. Oxidation of secondary alcohol gives

    (a)

    aldehydes

    (b)

    ketones

    (c)

    ethers

    (d)

    primary alcohols

  49. (a)

    H3PO2 and H2O

    (b)

    H+/H2O

    (c)

    HgSO4/H2SO4

    (d)

    Cu2Cl2

  50. Which of the following amines does not undergo acetylation?

    (a)

    t – butylamine

    (b)

    ethylamine

    (c)

    diethylamine

    (d)

    triethylamine

  51. Which of the following will not undergo Hoffman's bromamide reaction?

    (a)

    Ethanamide

    (b)

    Propanamide

    (c)

    Methanamide

    (d)

    Phenyl methanamide

  52. Use of chloropicrin is as ____________

    (a)

    explosive

    (b)

    dye

    (c)

    anaesthetic

    (d)

    sterilizing agent

  53. Complete hydrolysis of cellulose gives

    (a)

    L-Glucose

    (b)

    D-Fructose

    (c)

    D-Ribose

    (d)

    D-Glucose

  54. Which of the following statement is correct?

    (a)

    Ovalbumin is a simple food reserve in egg-white

    (b)

    Blood proteins thrombin and fibrinogen are involved in blood clotting

    (c)

    Denaturation makes protein more active

    (d)

    Insulin maintains the sugar level of in the human body

  55. A mixture ofD (+) glucose and D (-) fructose is known as__________

    (a)

    cane sugar

    (b)

    sweetless sugar

    (c)

    invert sugar

    (d)

    starch sugar

  56. Hereditary traits are carried by__________

    (a)

    nucleic acid

    (b)

    protein

    (c)

    lipid

    (d)

    carbohydrate

  57. Assertion: 2-methyl-1,3-butadiene is the monomer of natural rubber
    Reason: Natural rubber is formed through anionic addition polymerisation

    (a)

    If both assertion and reason are true and reason is the correct explanation of assertion

    (b)

    if both assertion and reason are true but reason is not the correct explanation of assertion.

    (c)

    assertion is true but reason is false

    (d)

    both assertion and reason are false

  58. The polymer used in making blankets (artificial wool) is

    (a)

    polystyrene

    (b)

    PAN

    (c)

    polyester

    (d)

    polythene

  59. Sucrose esters are used as _________

    (a)

    emulsifiers

    (b)

    preservatives

    (c)

    food colours

    (d)

    antioxidants

  60. Phenacetin is _______

    (a)

    antipyretic

    (b)

    analgesic

    (c)

    antibiotic

    (d)

    antiseptic

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