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Standard XI
Chemistry
Factors Affecting Equilibria
Question

Which of the following reactions will not get affected on increasing the pressure?

A
$$CH_{4(g)} + 2S_{2(g)} \rightleftharpoons CS_{2(g)} + 2 H_2S{(g)}$$
B
$$PCl_{5(g)} \rightleftharpoons PCl_{3(g)} + Cl_{2(g)}$$
C
$$4NH_{3(g)} + 5O_{2(g)} \rightleftharpoons 4NO_{(g)} + 6 H_2O{(g)}$$
D
$$2H_{2(g)} + CO_{(g)} \rightleftharpoons CH_3OH_{(g)}$$
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Solution
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Correct option is C. $$CH_{4(g)} + 2S_{2(g)} \rightleftharpoons CS_{2(g)} + 2 H_2S{(g)}$$
$$CH_{4(g)} + 2S_{2(g)} \rightleftharpoons CS_{2(g)} + 2 H_2S{(g)}$$

Since the number of moles of gaseous reactants and products are same ($$\Delta n_g=0$$), the reaction will not be affected by changing the pressure.

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