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NCERT Class XI Chemistry Equilibrium Solutions

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Question : 26
Total: 73
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) CaCO3(s) ⇌ CaO(s)+CO2(g)
(vi) 4NH3(g)+5O2(g) ⇌ 4NO(g)+6H2O(g)
Solution:  
Reactions will be affected in those in which (np ≠ nr)gaseous. Hence, reactions (i), (iii), (iv), (v) and (vi) will be affected. By applying Le Chatelier’s principle, we can predict the direction.
(i) np = 2, nr = 1 i.e., np > nr, reaction will go in the backward direction.
(ii) np = 3, nr = 3 i.e., np = nr, reaction will not be affected by pressure.
(iii) np = 2, nr = 1 i.e., np > nr, reaction will go in the backward direction.
(iv) np = 1, nr = 3 i.e., np < nr, reaction will go in the forward direction.
(v) np = 1, nr = 0 i.e., np > nr, reaction will go in the backward direction.
(vi) np = 10, nr = 9 i.e., np > nr, reaction will go in the backward direction.
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