Question

For a first order reaction a substance is
reduced to 1/3 in hundred second in what time will it
be reduced to 1/9 ?​

Answer 1

Answer:

Time taken to reduce by a factor of 14=20min

∴ Time taken to reduce by a factor 1/2

i.e., t1/2=10min

a−→t1/2a2−→t1/2a4−→t1/2a8−→t1/2a16

Total time required =4×t1/2=4×10min= 40