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Question

Which of the following equilibrium remains unaffected by a change in pressure (or volume)?

A
2NOCl(g)2NO(s)+Cl2(g)
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B
H2(g)+CO2(g)H2O(g)+CO(g)
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C
3PbS(s)+3O2(g)2PbO(s)+2SO2(g)
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D
PCl5(g)PCl3(g)+Cl2(g)
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Solution

The correct option is B H2(g)+CO2(g)H2O(g)+CO(g)
Equilibrium remain unaffected by change in pressure when Δn=0 for the reaction.
(a) 2NOCl(g)2NO(s)+Cl2(g)Δn=12=1
(b) H2(g)+CO2(g)H2O(g)+CO(g)Δn=1+111=0
(c) 3PbS(s)+3O2(g)2PbO(s)+2SO2(g)Δn=23=1
(d) PCl5(g)PCl3(g)+Cl2(g)Δn=1+11=1

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