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Ionic Equilibrium 1 Mark Creative Question Paper With Answer Key

12th Standard

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Chemistry

Time : 00:15:00 Hrs
Total Marks : 15

     Multiple Choice Question

    15 x 1 = 15
  1. What is the decreasing order of strength of bases
    OH, NH2- H - C ≡ C and CH3 - CH2-

    (a)

    OH->NH2- >H-C≡C >CH3-CH2-

    (b)

    NH2->OH->CH3-CH2- >H-C≡C

    (c)

    CH3-CH2->NH2->H-C≡C->OH-

    (d)

    OH->H-C ≡ C->CH3-CH2- >NH2-

  2. Inert pair effect is observed in groups _______.

    (a)

    14, 15

    (b)

    13, 14, 15

    (c)

    13, 14, 15, 16

    (d)

    All of these

  3. Which one among the following in the strongest Bronsted base.

    (a)

    \({ ClO }_{ 4 }^{ - }\)

    (b)

    \({ ClO }_{ 3 }^{ - }\)

    (c)

    \({ ClO }_{ 2 }^{ - }\)

    (d)

    \({ ClO }^{ - }\)

  4. Which of the following is not a Lewis acid?

    (a)

    SiCl4

    (b)

    AICl3

    (c)

    SO3

    (d)

    CO

  5. Analyses the equilibrium
    HClO4 +H2O ⇌ H3O+ \({ ClO }_{ 4 }^{ - }\)
    and choose the correct statement.

    (a)

    H3O+ is the conjugate base of H2O

    (b)

    CIO4- is the conjugate base of HCIO4

    (c)

    H2O is the conjugate acid of H3O+

    (d)

    HCIO4 is the conjugate acid of H3O+

  6. Pick the strongest conjugate base among the following

    (a)

    Cl-

    (b)

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

    (c)

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

    (d)

    CH3COO-

  7. Pick out the incorrect statement regarding Lewis acids and bases

    (a)

    A Lewis acid is a electron deficient molecule

    (b)

    Lewis bases is one which donates an electron pair

    (c)

    Lewis base is a cation

    (d)

    Lewis acid is a electron deficient molecule and Lewis base is a cation

  8. Pick the odd one out

    (a)

    Cl-

    (b)

    CaO

    (c)

    SO2

    (d)

    CH-3

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

    (a)

    Strong acid is one that completely dissociates in water

    (b)

    Ka is the dissociation constant

    (c)

    CH3COOH is a weak acid

    (d)

    Smaller the Ka value, greater is the acid strength

  10. Krepresents _______.

    (a)

    ionic product constant of water

    (b)

    Solubility product of water

    (c)

    Equilibrium constant of water

    (d)

    Buffer index

  11. HCl is a strong acid since _______.

    (a)

    It can be easily oxidised

    (b)

    It canbe easilyionised

    (c)

    It dissociates completely to give H+ ions in solution

    (d)

    It can be easily oxidised and It can be easilyionised

  12. The conjugate base of NH-2 is _______.

    (a)

    NH-

    (b)

    NH3

    (c)

    NH+3

    (d)

    NH2-

  13. Ionic product of water increases when _______.

    (a)

    Pressure decreases

    (b)

    H+ ions are added

    (c)

    OH- ions are added

    (d)

    temperature increases

  14. For two acids A and B, Ka values at 25°C are 2 x 106 and 1.8 x 10-4 respectively. which among the following is true with respect to the above data _______.

    (a)

    A and B are equally acidic

    (b)

    A is stronger than B

    (c)

    B is stronger than A

    (d)

    Ka value is not a measure of acid strength

  15. An aqueous solution with pH value zero is _______.

    (a)

    acidic

    (b)

    basic

    (c)

    amphoteric

    (d)

    neutral

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