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ChemistryJEE Main 28 Jan 2026, Shift 2·Q4·MCQ·Easy–moderate

Equilibrium · Equilibrium shift on adding reactant

Observe the following equilibrium in a 1 L flask.
A(g)⇌B(g)\ce{A(g) <=> B(g)}
At T(K), the equilibrium concentrations of A and B are 0.5 M and 0.375 M respectively. 0.1 moles of A is added into the flask and heated to T(K) to establish the equilibrium again. The new equilibrium concentrations (in M) of A and B are respectively.
  1. (1)0.367, 0.275
  2. (2)0.53, 0.4
  3. (3)0.742, 0.557
  4. (4)0.557, 0.418

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See the full 28 Jan 2026, Shift 2 paper