Which the following reaction will get affected by increasing the pressure? Also, mention whether change will cause the reaction to go into forward or backward direction.
(i) `COCl_(2) (g) hArr CO(g) + Cl_(2)(g)`
(ii) `CH_(4)(g) + 2S_(2)(g) hArr CS_(2)(g) + 2H_(2)S(g)`
(iii) `CO_(2)(g) + C(s) hArr 2CO(g)`
(iv) `2H_(2)(g) + CO(g) hArr CH_(3)OH(g)`
(v) `CaCO_(3)(s) hArr CaO(s) + CO_(2)(g)`
(vi) `4NH_(3)(g) + 5O_(2)(g) hArr 4NO(g) + 6H_(2)O(g)`

Explanation

According to Le-Chatelier.s principle, a reaction gets affected by a change in pressure when the number of moles of gaseous reactants is different from that of gaseous products. Therefore, the reactions will be affected by increasing the pressure. On increasing pressure,
reactions will go in the backward direction as
` n_p gt n_R: `