JEE Main 2024 Chemistry question
Consider the following reaction, the rate expression of which is given below A + B → C, rate = k [A][B]. The reaction is initiated by taking 1 M concentration A and B each. If the rate constant (k) is 4.6 × 10 s, then the time taken for A to become 0.1 M issec. (nearest integer)
Answer: 50
Solution
[A] = [B] throughout, so rate = k[A] (first order): t = (2.303/k) log(1/0.1) = 2.303/0.046 = 50 s.