Consider the following gaseous equilibrium in a closed container of volume "V" at T(K):
\(P_{2}(g)+Q_{2}(g)\rightleftharpoons2PQ(g)\).
2 moles each of \(P_{2}(g)\), \(Q_{2}(g)\) and PQ (g) are present at equilibrium. Now one mole each of '\(P_{2}\)' and '\(Q_{2}\)' are added to the equilibrium keeping the temperature at T(K). The number of moles of \(P_{2}\), \(Q_{2}\) and PQ at the new equilibrium, respectively, are -

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.