A) \[{{H}_{2}}(g)+{{I}_{2}}(g)2HI(g)\]
B) \[PC{{l}_{5}}(g)PC{{l}_{3}}(g)+C{{l}_{2}}(g)\]
C) \[{{N}_{2}}(g)+{{O}_{2}}(g)2NO(g)\]
D) \[{{N}_{2}}(g)+3{{H}_{2}}(g)2N{{H}_{3}}(g)\]
Correct Answer: B
Solution :
At equilibrium, low pressure favours those reactions which are accompanied by increase in total number of moles and high pressure favours those reactions which take place with decrease in total number of moles. However, pressure has no effect on an equilibrium reaction' which proceeds with no change in total number of moles. Hence, reaction \[PC{{l}_{5}}(g)PC{{l}_{3}}(g)+C{{l}_{2}}(g)\] is favoured by low pressure.
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