See image — AITS & Test Series Chemistry Question

💡 Solution & Explanation

Rate after 10 minutes =   6 8 2 10 8    Rate after 20 minutes =   4 6 2 10 8    Reaction of 1st order At = Ao – kt 0 = 8 – k  t t = 8 k 6 = 8 – k  10  2 10 k  t = 8 k = 8 40 2 10  min