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Ionic Equilibrium Model Question Paper

12th Standard EM

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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
  7. Calculate the pH of 0.04 M HNO3 Solution.

  8. Calculate the pH of 0.001M HCl solution

  9. Calculate pH of 10-7M HCl

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

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

  12. 5 x 3 = 15
  13. The Ka value for HCN is 10-9 . What is the pH of 0.4M HCN solution?

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

  15. 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.

  16. What is Henderson equation?

  17. What do you mean by buffer action?

  18. 2 x 5 = 10
  19. A particular saturated solution of silver chromate Ag2 CrO4 has \([Ag^{+}]=5\times10^{-5}\) and \([CrO_{4}]^{2-}=4.4\times10^{-4}M\).What is the value of Ksp for Ag2 CrO4?

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

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