JEE Main 2026 Chemistry question

One mole each of He and A(g) are taken in a 10 L closed flask and heated to 400 K to establish the following equilibrium. A(g)⇌B(g). for this reaction at 400 K is 4.0. The partial pressures (in atm) of He and B(g) are respectively (at equilibrium) (Assume He, A(g) and B(g) behave as ideal gases) (Given: R=0.082 L atm K⁻¹ mol⁻¹)

• (A)3.28, 2.624Correct
• (B)2.624, 3.28
• (C)3.28, 0.656
• (D)0.656, 6.56