MHT CET Chemistry Question (2026) — Solution

Step-by-step solution

For a zero order reaction, the rate is given by r = k[A]^0 = k. Thus, the rate is independent of the concentration of the reactant. The decomposition of acetaldehyde (CH_3CHO CH_4 + CO) is a fractional order reaction with an order of 1.5. For a first order reaction, the half-life is given by t_ 1/2 = 0.693 k . This shows that the half-life is independent of the initial concentration of the reactant. For a zero order reaction, the half-life is given by t_ 1/2 = [A]_0 2k . This shows that the half-life is directly proportional to the initial concentration of the reactant. Therefore, the only correct statement is that the half-life of a first order reaction is independent of the initial concentration of the reactant. Answer: Half life of first order reaction is independent of initial concentration of reactant.