See image — AITS & Test Series Chemistry Question

💡 Solution & Explanation

A 2B C 2 x 2x x      s 20 P 24 at t 12 hr 22 2x     x 1  mole which is half of the initial value. Hence, 12 hour is half-life for the above first order reaction. The above reaction will be completed 99% in 80 hrs.   s 20 P 24 at t 80 hr 22 2 1.8      s P