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75% of the first-order reaction was completed in 32 min. 50% of the reaction was completed in:

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75% of the first-order reaction was completed in 32 min. 50% of the reaction was completed in:

(a) 24 min
(b) 8 min
(c) 16 min
(d) 4 min

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1 Answer

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(c) 16 min

75 % of reaction is completed in two half-lives, i.e., 2 x t1/2 = 32 min or t1/2 = 16 min.

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