ChemistryJEE Main 5 Apr 2026, Shift 2·Q6·MCQ·Easy–moderate

Equilibrium · Kp from equilibrium amounts

The reaction $\ce{A(g) <=> B(g) + C(g)}$ was initiated with the amount ‘a' of A(g). At equilibrium it is found that the amount of A(g) remaining is $(a - x)$ at a total pressure of $p$ .

The equilibrium constant $K_\mathrm{p}$ of the reaction can be calculated from the expression :

(1) $\dfrac{x^2}{a^2 + x^2}\times p$
(2) $\dfrac{x^2}{a^2 - x^2}\times p$
(3) $\dfrac{a + x^2}{x^2}\times p$
(4) $\dfrac{a - x^2}{x^2}\times p$

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See the full 5 Apr 2026, Shift 2 paper