Chemical Kinetics Ques 17

17. A reaction is $50 \%$ completed in 2 hours and $75 \%$ completed in 4 hours. The order of reaction is

[NEET Kar. 2013]

(a) 0

(b) 1

(c) 2

(d) 3

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Answer:

Correct Answer: 17.(b)

Solution:

(b) For a first order reaction,

$ t _{75 \%} =2 \times t _{50 \%} $