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Class 11 Chemistry MCQ Chapter 7 Equilibrium
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Equilibrium
Chapter: 7
| MCQ |
1. What is the equilibrium mixture?
(i) Only products in the reaction.
(ii) Only reactants in the reaction.
(iii) Mixture of reactants and products in equilibrium.
(iv) A mixture that changes constantly.
Ans: (iii) Mixture of reactants and products in equilibrium.
2. For a pure substance, at atmospheric pressure, the temperature at which the solid and liquid phases are at equilibrium is called:
(i) Freezing point.
(ii) Boiling point.
(iii) Kraft temperature.
(iv) Absolute temperature.
Ans: (i) Freezing point.
3. What is the equilibrium involving CO molecules and haemoglobin responsible for?
(i) Oxygen delivery.
(ii) Oxygen storage.
(iii) CO toxicity.
(iv) CO2 absorption.
Ans: (iii) CO toxicity.
4. The liquid which has a ____ vapour pressure is more volatile and has a_____boiling point.
(i) Higher, lower.
(ii) Higher , higher.
(iii) Lower, lower.
(iv) Lower, higher.
Ans: (i) Higher, lower.
5. What would happen if the pressure inside the thermos flask was increased?
(i) Ice would melt faster.
(ii) The melting point of ice would decrease.
(iii) The freezing point of water would increase.
(iv) The equilibrium would shift in favour of the solid phase.
Ans: (iv) The equilibrium would shift in favour of the solid phase.
6. We know that the relationship between Kc and Kp is Kp=Kc(RT)Δn
For the reaction:
NH4Cl(s)→NH3(g)+HCl(g),
What is the value of Δnfor the reaction?
(i) 1
(ⅱ) 0.5
(iii) 1.5
(iv) 2
Ans: (iv) 2
7. The acid-base pair that differs by one __________ is called a conjugate acid-base pair.
(i) Electron.
(ii) Proton.
(iii) Hydronium ion.
(iv) Hydroxyl ion.
Ans: (ii) Proton.
8. A small amount of acetone is taken in a watch glass and it is kept open in atmosphere. Which statement is correct for the given experiment?
(i) The rate of condensation from vapour to liquid state is much less than the rate of evaporation.
(ii) The rate of condensation from vapour to liquid state is equal or less than the rate of evaporation.
(iii) The rate of condensation from vapour to liquid state is equal to the rate of evaporation.
(iv) None of these.
Ans: (ii) The rate of condensation from vapour to liquid state is much less than the rate of evaporation.
9. Which of the following is an example of solid-liquid equilibrium?
(i) Water and steam at 100 degrees centigrade.
(ii) Water and ice at 0 degrees centigrade.
(iii) The point where ammonia is sublimed.
(iv) Boiling point of water.
Ans: (ii) Water and ice at 0 degrees centigrade.
10. Which of the following is not a general characteristic of equilibria involving physical processes?
(i) Equilibrium is possible only in a closed system at a given tempera- ture.
(ii) All measurable properties of the system remain constant.
(iii) All the physical processes stop at equilibrium.
(iv) The opposing processes occur at the same rate and there is dynamic but stable condition.
Ans. (iii) All the physical processes stop at equilibrium.
11. Which of the following statements is false regarding the equilibrium constant?
(i) It has a definite value for every chemical reaction at a particular temperature.
(ii) It is independent of initial concentrations of the reactants.
(iii) It is dependent on the presence of a catalyst.
(iv) If K is the equilibrium constant for a backward reaction then the forward reaction’s equilibrium constant is 1/k.
Ans: (iii) It is dependent on the presence of a catalyst.
12. Why does the mercury level in the right limb of the manometer increase?
(i) Due to the addition of water vapour molecules into the gaseous phase.
(ii) Because of the absorption of vapour by the drying agent.
(iii) Due to a decrease in the pressure inside the box.
(iv) Because water stops evaporating.
Ans: (i) Due to the addition of water vapour molecules into the gaseous phase.
13. What is the role of a drying agent like anhydrous calcium chloride in the experiment described?
(i) To increase the pressure inside the box.
(ii) To absorb any water vapour present.
(iii) To prevent water from evaporating.
(iv) To increase the temperature of the system.
Ans: (ii) To absorb any water vapour present.
14. What will happen if the rate of evaporation is equal to the rate of condensation in th4 water?
(i) Solid-liquid equilibrium.
(ii) Liquid-vapour equilibrium.
(iii) Solid-vapour equilibrium.
(iv) Melting.
Ans: (ii) Liquid-vapour equilibrium.
15. What is the normal boiling point of water at one atmospheric pressure (1.013 bar)?
(i) 100°C
(ii) 90°C
(iii) 120°C
(iv) 80°C
Ans: (i) 100°C
