For a first-order reaction, — Chemical Kinetics Chemistry Question

💡 Solution & Explanation

For 1st order, dissociated amount x = A0(1 - e^-kt), so degree of dissociation α = x/A0 = (1 - e^-kt). The pre-exponential factor A has the same units as k, which for a 1st order reaction is time^-1. Time for 75% completion is twice t1/2, not thrice. Therefore, correct answer is A,D.