Q.
The reactions: PCl5(g)↔PCl3(g)+Cl2(g) & COCl2(g)↔CO(g)+Cl2(g) are simultaneously in equilibrium at constant volume in same vessel. A few moles of CO(g) are introduced into the vessel. After some time, the new equilibrium concentration of
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a
PCl5 will remain unchanged
b
Cl2 will be greater
c
PCl5 will becomes less
d
PCl5 will becomes greater
answer is C.
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Detailed Solution
Addition of CO(g) will increase rate of backward reaction of reaction COCl2(g)↔CO(g)+Cl2(g) , with this concentration of Cl2(g) decreases, hence rate of decomposition of PCl5 increases , resulting the decrease in concentration of PCl5 .
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