Among the following equilibria, the number in which increasing the pressure (by compression at constant temperature) increases the amount of products is (1) N 2 ( g ) + 3 H 2 ( g ) ⇌ 2 N H 3 ( g

Question

Among the following equilibria, the number in which increasing the pressure (by compression at constant temperature) increases the amount of products is

(1) $N_{2} (g) + 3 H_{2} (g) ⇌ 2 N H_{3} (g)$

(2) $PC l_{5} (g) ⇌ PC l_{3} (g) + C l_{2} (g)$

(3) $2 S O_{2} (g) + O_{2} (g) ⇌ 2 S O_{3} (g)$

(4) $H_{2} (g) + I_{2} (g) ⇌ 2 H I (g)$

(5) $N_{2} O_{4} (g) ⇌ 2 N O_{2} (g)$

(6) $2 N O_{2} (g) ⇌ N_{2} O_{4} (g)$

(7) $C (s) + C O_{2} (g) ⇌ 2 CO (g)$

(8) $2 CO (g) + O_{2} (g) ⇌ 2 C O_{2} (g)$

TestHub · Accepted Answer

High pressure favours products only when gaseous moles decrease ( $Δ n < 0$ ).

(1) $2 - 4 = - 2$ yes. (2) +1 no. (3) $2 - 3 = - 1$ yes. (4) 0 no. (5) +1 no. (6) -1 yes. (7) $2 - 1 = + 1$ no. (8) $2 - 3 = - 1$ yes.

Reactions 1, 3, 6 and 8 qualify.

Answer: 4.

Chemistry - Chemical Equilibrium Question with Solution | TestHub

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