MHT CET Chemistry question

The reaction is started with 10 g of L. After 30 and 90 minutes, 5 g and 1.25 g of L are left respectively. The order of reaction is

(A)0
(B)2
(C)1Correct
(D)3

Answer: (C)

Solution

10 g falls to 5 g in 30 min and to 1.25 g (=10/8) in 90 min, i.e. three successive equal half-lives of 30 min; a constant half-life independent of concentration

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Question ID VK-068866