Reaction A(g) 2B(g) + C(g) is a first order reaction. It was started with pure A t/min Pressure of system at time t/mm Hg 160 Which of the following option is incorrect ? (A) Initial pressure of A is

Question

Reaction A(g) 2B(g) + C(g) is a first order reaction. It was started with pure A t/min Pressure of system at time t/mm Hg 160 Which of the following option is incorrect ?

(A) Initial pressure of A is 80 mm Hg
(B) The reaction never goes to completion
(C) Rate constant of the reaction is 1.693 min–1
(D) Partial pressure of A after 10 minute is 40 mm Hg | JEE(Main) 2025 | DATE : 07-04-2025 (SHIFT-1) | PAPER-1 | CHEMISTRY PAGE # 6

Prashant Kotian · Accepted Answer

Correct answer: C. A(g)  2B(g) + C(g) t = 0 P0 t =  2P0 P0 P = 3P0 = 240 P0 = 80 mm of Hg Kt = ln           t P P P P K × 10 = ln         240 240 K = 2 ln = 0.0693 min–1

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