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MCQs on Equilibrium
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MCQs on Equilibrium
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19 Questions

1. The ionisation constant of an acid, Ka, is the measure of strength of an acid. The Ka values of acetic acid, hypochlorous acid and formic acid are 1.74 × 10–5, 3.0 × 10–8 and 1.8 × 10–4 respectively. Which of the following orders of pH of 0.1 mol dm–3 solutions of these acids is correct?
2. Ka for CH3COOH is 1.8 × 10–5 and Kb for NH4OH is 1.8 × 10-5 . The pH of ammonium acetate will be
3. The ionisation constant of an acid, Ka, is the measure of strength of an acid. The Ka values of acetic acid, hypochlorous acid and formic acid are 1.74 × 10–5, 3.0 × 10–8 and 1.8 × 10–4 respectively. Which of the following orders of pH of 0.1 mol dm–3 solutions of these acids is correct?
4. 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?
5. Which of the following statements is incorrect?
6. Ka for CH3COOH is 1.8 × 10–5 and Kb for NH4OH is 1.8 × 10-5 . The pH of ammonium acetate will be
7. "We know that the relationship between Kc and Kp is
Kp = Kc (RT)Δ n
What would be the value of Δn for the reaction
NH4Cl (s) ⇔ NH3 (g) + HCl (g)"
8. Which of the following options will be correct for the stage of half completion of the reaction A ⇔ B.
9. What will be the value of pH of 0.01 mol dm–3 CH3COOH (Ka = 1.74 × 10–5)?
10. In which of the following solvents is silver chloride most soluble?
11. 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?
12. For the reaction H2(g) + I2(g) ⇔ 2HI (g), the standard free energy is ΔG⊖ > 0. The equilibrium constant (K ) would be __________.\r\n
13. The pH of neutral water at 25°C is 7.0. As the temperature increases, ionisation of water increases, however, the concentration of H+ ions and OH– ions are equal. What will be the pH of pure water at 60°C?
14. Acidity of BF3 can be explained on the basis of which of the following concepts?
15. 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?
16. Which of the following statements is incorrect?
17. Ka1, Ka2 and Ka3 are the respective ionisation constants for the following reactions.
H2S ⇔ H+ + HS–
HS– ⇔ H+ + S2–
H2S ⇔ 2H+ + S2–
The correct relationship between Ka1, Ka2 and Ka3 is
18. In which of the following solvents is silver chloride most soluble?
19. In which of the following reactions, the equilibrium remains unaffected on addition of small amount of argon at constant volume?

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