If 20 mL of an acidic solution of pH 3 is diluted to 100 mL, the

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 Multiple Choice QuestionsMultiple Choice Questions

91.

The solubility of AgCl is 1 x 10-5 mol/L. Its solubility in 0.1 molar sodium chloride solution is

  • 1 × 10-10

  • 1 × 10-5

  • 1 × 10-9

  • 1 × 10-4


92.

When ammonium chloride is added to ammonia solution, the pH of the resulting solution will be

  • increased

  • seven

  • decreased

  • unchanged


93.

Calculate pH of a buffer prepared by adding 10 mL of 0.10 M acetic acid to 20 mL of 0.1 M sodium acetate [ pKa (CH3COOH) = 4.74 ]

  • 3.00

  • 4.44

  • 4.74

  • 5.04


94.

The degree of dissociation of a 0.01 M weak acid is 10-3. Its pOH is

  • 5

  • 3

  • 9

  • 11


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95.

0.1 M solution of which of the following has almost unity degree of dissociation ?

  • Ammonium chloride

  • Potassium chloride

  • Sodium acetate

  • All of the above


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96.

If 20 mL of an acidic solution of pH 3 is diluted to 100 mL, the H+ ion concentration will be

  • 1 × 10-3 M

  • 2 × 10-3 M

  • 2 × 10-4 M

  • 0.02 × 10-4 


C.

2 × 10-4 M

pH = 3

[H+] = 1 × 10-3 M = 1 × 10-3 N

   N1V1 = N2V2

1 × 10-3 × 20 = N2 × 100

       N2 = 2 × 10-4

 [H+] = 2 × 10-4 M


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97.

If E  is the heat of reaction for

C2H5OH(l) + 3O2(g)  2CO2(g) + 3H2O(l) at constant volume, the H (heat of reaction at constant pressure), at constant temperature is

  • H = E + RT

  • H = E - RT

  • H = E - 2RT

  • H = E + 2RT


98.

Which one of the following species acts as both Bronsted acid and base?

  • H2PO2-

  • HPO32-

  • HPO42-

  • All of these


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99.

The number of hydroxyl ions in 10 cm3 of 0.2 M HCl solution is

  • 5 × 10-14

  • 3 × 109

  • 3 × 1012

  • 5 × 10-12


100.

Solubility of Ca(OH)2 is s mol L-1. The solubility product (Ksp) under the same condition is

  • 4s3

  • 3s4

  • 4s2

  • s3


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