JEE Main 2024 Chemistry question
Time required for completion of 99.9% of a First order reaction is times of half life (t₁/₂) of the reaction.
Answer: 10
Solution
t₉₉.₉ = (2.303/k) log(100/0.1) = (2.303/k)(3) and t₅₀ = (2.303/k)(0.3). So t₉₉.₉/t₅₀ = 3/0.3 = 10.