1.

The value of rate constant for a first order reaction 2.303 xx 10^(-2) sec^(-1) .what will be time required to reduce the concentration to (1)/(10) th its initial concentration

Answer»

10 second
100 second
2303 second
230.3 second

SOLUTION :`t = (2.303)/(K)` LOG `([A_(0)])/([A])`
`t = (2.303)/(2.303 xx 10^(-2)) "log" (100)/(10) IMPLIES t = 10^(2)` log 10 `implies t = 100` sec


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