1.

Reaction favoured by low pressure is :

Answer»

`H_2 + I_2 ⇌ 2HI`
`PCl_5 ⇌ PCl_3 + Cl_2`
`N_2 + 3H_2 ⇌ 2NH_3`
`N_2 + O_2 ⇌ 2NO`

ANSWER :B


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