Difficult
Which of the following reactions will be affected by increasing the pressure? Also,mention whether the change will cause the reaction to proceed in the forward or backward direction.
$(i)$ $CaCl_{2(s)} \rightleftharpoons CO_{(g)} + Cl_{2(g)}$
$(ii)$ $CH_{4(g)} + 2S_{2(g)} \rightleftharpoons CS_{2(g)} + 2H_{2}S_{(g)}$
$(iii)$ $CO_{2(g)} \rightleftharpoons C_{(s)} + 2CO_{(g)}$
$(iv)$ $2H_{2(g)} + CO_{(g)} \rightleftharpoons CH_{3}OH_{(g)}$
$(v)$ $CaCO_{3(s)} \rightleftharpoons CaO_{(s)} + CO_{2(g)}$
$(vi)$ $4NH_{3(g)} + 5O_{2(g)} \rightleftharpoons 4NO_{(g)} + 6H_{2}O_{(g)}$
$(i)$ $CaCl_{2(s)} \rightleftharpoons CO_{(g)} + Cl_{2(g)}$
$(ii)$ $CH_{4(g)} + 2S_{2(g)} \rightleftharpoons CS_{2(g)} + 2H_{2}S_{(g)}$
$(iii)$ $CO_{2(g)} \rightleftharpoons C_{(s)} + 2CO_{(g)}$
$(iv)$ $2H_{2(g)} + CO_{(g)} \rightleftharpoons CH_{3}OH_{(g)}$
$(v)$ $CaCO_{3(s)} \rightleftharpoons CaO_{(s)} + CO_{2(g)}$
$(vi)$ $4NH_{3(g)} + 5O_{2(g)} \rightleftharpoons 4NO_{(g)} + 6H_{2}O_{(g)}$
(A) In chemical equilibrium,the effect of pressure is observed only if the change in the number of gaseous moles,$\Delta n_g \neq 0$.
According to Le Chatelier's principle,increasing the pressure shifts the equilibrium in the direction where the number of gaseous moles decreases.
According to Le Chatelier's principle,increasing the pressure shifts the equilibrium in the direction where the number of gaseous moles decreases.
| $Reaction$ | $Effect$ $of$ $increasing$ $pressure$ |
| $(i).$ $\Delta n_g = +1$ | Backward $direction$ |
| $(ii).$ $\Delta n_g = 0$ | No $effect$ |
| $(iii).$ $\Delta n_g = +1$ | Backward $direction$ |
| $(iv).$ $\Delta n_g = -2$ | Forward $direction$ |
| $(v).$ $\Delta n_g = +1$ | Backward $direction$ |
| $(vi).$ $\Delta n_g = +1$ | Backward $direction$ |
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