Match each reaction in Column I with the effect of adding water in Column II (reactions in aqueous solution; H 2 O ( l ) is left out of K ) (a Column I entry may match more than one Column II entry)

Question

Match each reaction in Column I with the effect of adding water in Column II (reactions in aqueous solution; $H_{2} O (l)$ is left out of $K$ ) (a Column I entry may match more than one Column II entry):

Column I (Reaction)	Column II (Effect on addition of water)
(P) $A (a q) ⇌ B (a q) + H_{2} O (l)$	(1) Moles of A increases
(Q) $2 A (a q) ⇌ 3 B (a q)$	(2) Moles of B increases
(R) $3 A (a q) + H_{2} O (l) ⇌ 2 B (a q)$	(3) Molar concentration of A decreases
(S) $A (a q) ⇌ 2 B (a q) + H_{2} O (l)$	(4) Molar concentration of B decreases

Choose the option with the correct matching:

TestHub · Accepted Answer

Dilution by a factor d divides every concentration by d, so concentrations of A and B always fall (3, 4). Then compare $Q$ with $K$ .

(P) $K = [B] / [A]$ : $Q$ is unchanged, no shift: (3, 4).

(Q) $K = [B]^{3} / [A]^{2}$ : $Q$ becomes $Q / d < K$ , forward: moles of B increase (2, 3, 4).

(R) $K = [B]^{2} / [A]^{3}$ : $Q$ becomes $Q d > K$ , backward: moles of A increase (1, 3, 4).

(S) $K = [B]^{2} / [A]$ : $Q$ becomes $Q / d < K$ , forward: (2, 3, 4).

Correct matching: P to 3,4; Q to 2,3,4; R to 1,3,4; S to 2,3,4. Answer: (C).

Chemistry - Chemical Equilibrium Question with Solution | TestHub

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