Equilibrium

What will be the correct order of vapour pressure of water, acetone and ether at 30°C. Given that among these compounds, water has maximum boiling point and ether has minimum boiling point?

(i) Water < ether < acetone

(ii) Water < acetone < ether

(iii) Ether < acetone < water

(iv) Acetone < ether < water

On increasing the pressure, in which direction will the gas phase reaction proceed to re-establish equilibrium, is predicted by applying the Le Chatelier's principle. Consider the reaction.

N₂ (g) + 3H₂ (g) ⇌2NH₃ (g)

Which of the following is correct, if the total pressure at which the equilibrium is established, is increased without changing the temperature?

(i) K will remain same

(ii) K will decrease

(iii) K will increase

(iv) K will increase initially and decrease when pressure is very high

Which of the following options will be correct for the stage of half completion of the reaction A ⇌ B.

(i) ∆Gᶱ = 0

(ii) ∆Gᶱ> 0

(iii) ∆Gᶱ< 0

(iv) ∆Gᶱ= –RT ln2

Ka for CH₃COOH is 1.8 * 10^–5 and K b for NH₄OH is 1.8 * 10^–5 . The pH of ammonium acetate will be

(i) 7.005

(ii) 4.75

(iii) 7.0

(iv) Between 6 and 7

What will be the value of pH of 0.01 mol dm^–3 CH₃COOH (Ka = 1.74 * 10^–5 )?

(i) 3.4

(ii) 3.6

(iii) 3.9

(iv) 3.0

In which of the following solvents is silver chloride most soluble?

(i) 0.1 mol dm^–3 AgNO3 solution

(ii) 0.1 mol dm^–3 HCl solution

(iii) H₂O

(iv) Aqueous ammonia

Which of the following will produce a buffer solution when mixed in equal volumes?

(i) 0.1 mol dm^–3 NH₄OH and 0.1 mol dm^–3 HCl

(ii) 0.05 mol dm^–3 NH₄OH and 0.1 mol dm^–3 HCl

(iii) 0.1 mol dm^–3 NH₄OH and 0.05 mol dm^–3 HCl

(iv) 0.1 mol dm^–3 CH₄COONa and 0.1 mol dm^–3 NaOH

Acidity of BF₃ can be explained on the basis of which of the following concepts?

(i) Arrhenius concept

(ii) Bronsted Lowry concept

(iii) Lewis concept

(iv) Bronsted Lowry as well as Lewis concept

Acidity of BF₃ can be explained on the basis of which of the following concepts?

(i) Arrhenius concept

(ii) Bronsted Lowry concept

(iii) Lewis concept

(iv) Bronsted Lowry as well as Lewis concept

K_a1 , K_a2 and K_a3 are the respective ionisation constants for the following reactions.

H₂S $\mathit{}\to$   H⁺ + HS

HS^–  $\mathit{}\to$ H⁺ + S²

 H₂S $\mathit{}\to$ 2H⁺ + S²

The correct relationship between is K_a1 , K_a2 and K_a3

1. K_a3= K_a1 * K_a2
2. K_a3= K_a1 + K_a2
3. K_a3= K_a1 – K_a2
4. K_a3= K_a1 / K_a2