The pH of a soft drink is 3.92. The hydrogen ion concentration wi

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 Multiple Choice QuestionsMultiple Choice Questions

281.

Consider the following reversible reactions,

N2(g) + 3H2(g)  2NH3(g) (K1)  ...(i)

N2 (g) + O2(g) 2NO (g) (K2) ....(ii)

H2 (g) + 12O2(g) H2O (g) (K3)   ....(iii)

The equilibrium constant for the reaction:

2NH3(g) + 52O2(g)2NO(g) + 3H2O (g) will be

  • K1 K2 K3

  • K1K2K3

  • K1K33K2

  • K2K33K1


282.

The number of moles of sodium acetate to be added to 0.1 M acetic acid for the buffer to have a pH = 4.7 is [pKa for acetic acid is 4.7]

 

  • 0.2

  • 0.4

  • 0.1M

  • None of these


283.

If Kc is the equilibrium constant for the formation of NH3, the dissociation constant of NH3 under the same condition will be

  • 1Kc

  • KC2

  • KC

  • KC


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284.

The pH of a soft drink is 3.92. The hydrogen ion concentration will be

( given antilog 0.08 = 1.2)

  • 1.96 × 10-2 mol L-1

  • 1.96 × 10-3 mol L-1

  • 1.2 × 10-4 mol L-1

  • 1.2 × 10-3 mol L-1


C.

1.2 × 10-4 mol L-1

pH = 3.92

 pH = -log[H+]

 3.92 = -log [H+

or, -3.92 = log [H+]

or, [H+] = antilog 4.08

or, [H+] = 1.2 × 10-4


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285.

An example of a salt that will not hydrolyse is

  • CH3COONH4

  • CH3COOK

  • NH4Cl

  • KCl


286.

20 mL of 0.25 N strong acid and 30 mL 0·2 N of strong base are mixed; the resulting solution is

  • 0.02 N acidic

  • 0.025 N basic

  • 0.02 N basic

  • 0.025 N acidic


287.

The rate of forward reaction is two times that of reverse reaction at a given temperature and identical concentration. K

  • 2.5

  • 2.0

  • 0.5

  • 1.5


288.

Ammonium ion is

  • neither an acid nor base

  • both an acid and a base

  • a conjugate acid

  • a conjugate base


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289.

A is an aqueous acid; B is an aqueous base. They are diluted separately, then

  • pH of A decreases and pH of B increases

  • pH of A increases and pH of B decreases till pH in each case is 7

  • pH of A and B increase

  • pH of B and A decrease


290.

What is the solubility of silver bromide in one litre of 0.4 molar NH3 solution (K =10x108)?

  • 80 × 10-6 mol

  • 2.8 × 10-3 mol

  • 115 × 10-3 mol

  • 0.98 g


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