In which one of the following equilibrium, pressure has no effect :
A
PCl5⇌PCl3+Cl2
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B
2NH3⇌N2+3H2
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C
2SO2+O2⇌2SO3
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D
N2+O2⇌2NO
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Solution
The correct option is DN2+O2⇌2NO With increase in pressure, the reaction goes in the direction where the number of moles of is decreasing.
In all reaction except option D, there is change in number of moles from reactants to products or vice-versa. so there will be influence of pressure to equilibrium of reaction.
change in number of moles :
option-A: 1 to 1+1
option-B: 2 to 1+3
option-C: 2+1 to 2
option-D: 1+1 to 2
In option D, since there is no change in no of moles pressure will have no effect.