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Several reversible reactions (List-I) are at equilibrium at 300 K. The effect on each system when the volume is increased is listed in List-II. Match each reaction in List-I with the correct effect from List-II. List-I: (P) A(g) ⇌ 2B(g) (Q) A(s) ⇌ 2B(g) (R) 2A(g) ⇌ B(g) (S) 3A(g) ⇌ B(g) + 2C(g) List-II: (1) Moles of reactant decrease (2) Moles of reactant increase (3) Molar concentration of reactant increases (4) Molar concentration of reactant decreases

1. P -> 1; Q -> 4; R -> 1; S -> 4
2. P -> 1; Q -> 4; R -> 3; S -> 1
3. P -> 2; Q -> 4; R -> 1; S -> 4
4. P -> 2; Q -> 3; R -> 1; S -> 4

Correct answer: P -> 2; Q -> 4; R -> 1; S -> 4

Solution

For each reaction, increasing volume shifts equilibrium toward the side with more gas moles. This increases or decreases reactant moles depending on the reaction direction, and the resulting concentration must also be evaluated considering both the shift and the dilution effect.

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