Class XI Chemistry Equilibrium 5

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Question 1

Calculate buffer capacity of 1 litre of a mixture of 0.1 M CH₃COOH and 0.1 M CH₃COONa. (Given = 4.74)

• A2.303 × 0.05
• B0.1 × 2.303
• C1 × 2.303
• DNone of these

Question 2

What fraction of an indicator Hln is in the basic form at a pH of 6 if the pK_a of the indicator is 5?

• A
• B
• C
• D

Question 3

The solubility of CaCO₃ in gm/lit is -
(Given = 9 × 10^–8)

• A0.03 g/L
• B0.3 g/L
• C3 g/L
• DNone of these

Question 4

The solubility of silver oxalate in 10^–2 M potassium oxalate solution is -
(Given = 10^–10)

• A5 × 10^–5
• B4 × 10^–4
• C3 × 10^–3
• D2 × 10^–2

Question 5

Calculate the solubility of AgCl in 2.7 M NH₃ solution - (Given= 10^–10 & K_f [Ag(NH₃)₂]⁺ = 1.6 × 10⁷)

• A0.1 mol/L
• B0.2 mol/L
• C0.01 mol/L
• DNone of these

Question 6

The solubility product of AgCl is 1.8 × 10^–10. Precipitation of AgCl will occur only when equal volumes of solutions of -

• A10^–4 M Ag⁺ and 10^–4 M Cl^– are mixed
• B10^–7 M Ag⁺ and 10^–7 M Cl^– are mixed
• C10^–5 M Ag⁺ and 10^–5 M Cl^– are mixed
• D10^–10 M Ag⁺ and 10^–10 M Cl^– are mixed

Question 7

The solubility product of BaCrO₄ is 2.4 × 10^–10 M². The maximum concentration of Ba(NO₃)₂ possible without precipitation in a 6× 10^–4 M K₂CrO₄ solution is -

• A4 × 10^–7 M
• B1.2 × 10¹⁰ M
• C6 × 10^–10 M
• D3 × 10^–4 M

Question 8

The values of K_sp of following sparingly soluble salts Ni(OH)₂, Ce(OH)₄, AgCN and Al₂(SO₄)₃ are respectively 2 × 10^–15, 4 × 10^–35, 6 × 10^–17 and 3.2 × 10^–34.
Which salt is most soluble?

• ANi(OH)₂
• BCe(OH)₄
• CAl₂(SO₄)₃
• DAgCN

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