1.

In a first order reaction the concentration of the reactant decreases from 0.8 to 0.4 M in 15 minutes . The time taken for the concentration to change from 0.1 M to 0.025 M is :

Answer»

a) 7.5 MINS
B) 15 mins
C) 30 mins
d) 60 mins

Solution :(C ) `t_(1//2) ` is 15 MIN
`:.` Conc . Reduces from 0.1 to0.025 M in `2t_(1//2)`
i.e 30 min


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