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Ionic Equilibrium

12th Chemistry - Ionic Equilibrium Model Question Paper

Ionic Equilibrium Model Question Paper

12th Standard

    Reg.No. :
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Chemistry

Time : 01:00:00 Hrs
Total Marks : 40
    5 x 1 = 5

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

    (a)

    2.42 × 10-8mol3L-3

    (b)

    2.66 × 10-12mol3L-3

    (c)

    4.5 × 10-11mol3L-3

    (d)

    5.619 × 10-12mol3L-3

  2. Which of these is not likely to act as Lewis base?

    (a)

    BF3

    (b)

    PF3

    (c)

    CO

    (d)

    F–

  3. 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-

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

    (a)

    2 × 10-3M

    (b)

    4 × 10-4M

    (c)

    1.6 × 10-5M

    (d)

    1.8 × 10-5M

  5. Pick the strongest conjugate base among the following

    (a)

    Cl-

    (b)

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

    (c)

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

    (d)

    CH3COO-

    6. 5 x 2 = 10

  6. Calculate the pH of 0.04 M HNO3 Solution.

  7. Calculate the pH of 0.001M HCl solution

  8. Calculate pH of 10-7 M HCl

  9. How is common ion effect related to the solubility of the electrolyte?

  10. What are the limitations of Ostwald's dilution law?

    11. 5 x 3 = 15

  11. The Ka value for HCN is 10-9. What is the pH of 0.4M HCN solution?

  12. Derive an expression for the hydrolysis constant and degree of hydrolysis of salt of strong acid and weak base.

  13. A solution of 0.10M of a weak electrolyte is found to be dissociated to the extent of 1.20% at 25oC. Find the dissociation constant of the acid.

  14. What is Henderson equation?

  15. What do you mean by buffer action?

    16. 2 x 5 = 10

  16. A particular saturated solution of silver chromate Ag2CrO4 has \([Ag^{+}]=5\times10^{-5}\) and \([CrO_{4}]^{2-}=4.4\times10^{-4}M\). What is the value of Ksp for Ag2 CrO4?

  17. Write the expression for the solubility product of Hg2Cl2 .

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