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In which one of the following equilibria...

In which one of the following equilibria, the increase of pressure over the equilibrium will favour the backward reaction

A

Decomposition equilibrium of HI

B

Formation equilibrium of `SO_3`

C

Decomposition equilibrium of `NH_3`

D

Formation equilibrium of `PCl_5`

Text Solution

Verified by Experts

The correct Answer is:
C
According to Le-Chatelier.s principle, if a system at equilibrium is subjected to a change of concentration, pressure or temperature, the equilibrium shifts in the direction that tends to undo the effect of the change. When the pressure on the system is increased, the equilibrium will shift in the direction in which there is decrease in number of moles.
(a) `2HI hArr H_2 +I_2`
(b) `SO_2 +1//2O_2 hArr SO_3`
(c) `2NH_(3) hArr N_2 +3H_2`
(d) `PCl_3 +Cl_2 hArr PCl_5`
So, in reaction (c) the increase in pressure will favour backward reaction.
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