1.

For a first order reaction, the time taken to reduce the initial concentration by a factor of (1)/(4) is 20 minutes. The time required to reduce initial concentration by a factor of 1//16 is

Answer»

20 min
10 min
80 min
40 min

Solution :Time taken to REDUCE by factor of `(1)/(4) = 20` min.
`therefore` Time taken to reduce by factor of `(1)/(2)`
i.e., `t_(1//2) = 10 min`
`aoverset(t_(1//2))to(a)/(2)overset(t_(1//2))to(a)/(4)overset(t_(1//2))to(a)/(8)overset(t_(1//2))to(a)/(16)`
Toral time required ` = 4 xx t_(1//2) = 4 xx 10 min = 40 min`


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