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Question

Which of the following reactions will not be affected by increasing the pressure?

A
PCl5(g)PCl3(g)+Cl2(g)
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B
N2(g)+O2(g)2NO(g)
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C
CaCO3(s)CaO(s)+CO2(g)
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D
CO(g)+H2O(g)CO2(g)+H2(g)
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Solution

The correct options are
B N2(g)+O2(g)2NO(g)
D CO(g)+H2O(g)CO2(g)+H2(g)
Reactions which have Δn=0 won't be affected by any change in pressure.
a. Δn=1+11=1
b. Δn=2(1+1)=0
c. Δn=10=1
d. Δn=1+1(1+1)=0
Δn is zero in (b) and (d), so (b) and (d) are not effected by pressure.

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