For a given reaction of first order, it ...

For a given reaction of first order, it takes `20` minutes for the concentration to drop from `1.0 "mol liter"^(-1)` to `0.6 "mol litre"^(-1)`. The time required for the concentration to drop from `0.6 "mol litre"^(-1)` to `0.36 "mol litre"^(-1)` will be

more than 20 minutes

less than 20 minutes

equal to 2 minutes

inifinity

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