r = k[A] for a reaction, 50% of A is decomposed in 120 minutes. The time taken for 90% decomposition of A is _____ minutes.
Answer: 399
Solution
Since , the reaction is first order, so min.
For 90% decomposition (10% of A remaining), the first-order integrated rate law gives
Equating the two expressions for :
minutes.
For 90% decomposition (10% of A remaining), the first-order integrated rate law gives
Equating the two expressions for :
minutes.
JEE Main · 2024 · 31 Jan 2024 · Shift 2 · Integer answer