Chemistry Class 11 NCERT Solutions: Chapter 7 Equilibrium Part 11

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Chemistry Class 11 NCERT Solutions Chapter 7 Equilibrium Part 11

Q: 30. At 473 K, equilibrium constant for decomposition of phosphorus pentachloride, is . If decomposition is depicted as,

Image of Equilibrium Calculations

Image of Equilibrium Calculations

Image of Equilibrium Calculations

(A) Write an expression for for the reaction

(B) What is the value of for the reverse reaction at the same temperature?

(C) What would be the effect on if (i) more is added (ii) pressure is increased? (iii) The temperature is increased?

Answer:

(A)

(B) Value of for the reverse reaction at the same temperature is:

(C) (i) would remain the same because in this case, the temperature remains the same.

(ii) is constant at constant temperature. Thus, in this case, would not change.

(iii) In an endothermic reaction, the value of increases with an increase in temperature. Since the given reaction in an endothermic reaction, the value of will increase if the temperature is increased.

Q: 31. Dihydrogen gas used in Haber’s process is produced by reacting methane from natural gas with high temperature steam. The first stage of two stage reaction involves the formation of . Second stage, formed in first stage is reacted with more steam in water gas shift reaction,

If a reaction vessel at is charged with an equimolar mixture of CO and steam such that bar, what be the partial pressure of at equilibrium?

Answer:

Let the partial pressure of both carbon dioxide and hydrogen gas be p. The given reaction is

It is given that

Now,

Hence, at equilibrium, the partial pressure of will be 3.04 bar.

Q: 32. Predict which of the following reaction will have appreciable concentration of reactants and products:

Image of Concentration of Reactants and Products

Image of Concentration of Reactants and Products

Image of Concentration of Reactants and Products

(A)

(B)

(C)

Answer: If the value of lies between a reaction has appreciable concentration of reactants and products. Thus, the reaction given in (c) will have appreciable concentration of reactants and products

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