Question

Question 7.26 Which of the following reactions will get affected by increasing the pressure?

Also, mention whether change will cause the reaction to go into forward or backward direction.

(i) COCl2(g) <---> CO(g) + Cl2(g)

(ii) CH4(g) + 2S2(g) <---> CS2(g) + 2H2S(g)

(iii) CO2(g) + C(s) <---> 2CO(g)

(iv) 2H2(g) + CO(g) <---> CH3OH(g)

(v) CaO(s) + CO2(g) <---> CaCO3(s)

(vi) 4NH3(g) + 5O2(g) <---> 4NO(g) + 6H2O(g)

Class XI Equilibrium Page 227

Answer 1

a. backward reaction is favoured
b. no effect
c. backward reaction is favoured
d. forward reaction is favoured
e. forward reaction is favoured
f. forward reaction is favoured

Answer 2

concept :- Le - Chatelier's principle
when pressure increases , equilibrium shifts in the direction where pressure decreases ( e.g., equilibrium shifting favor of number of moles are less ) . Furthermore if np ≠ nr the change in pressure affects the equilibrium.

(i) np (2) > nr (1) , the reaction will go in backward direction.
(ii) np = nr , the reaction won't be affected by increasing pressure.
(iii) np > nr , the reaction will go backward direction.
(iv) np < nr , the reaction will go forward direction.
(v) np > nr, the reaction will go backward direction.
(vi) np > nr , the reaction will go backward direction.