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Q.

Half-life of a first order reaction is 5 min. The concentration of reactant after 30 min if its initial concentration is 128 mmol L-1 is

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a

128mmol L-1/24

b

128mmol L-1/25

c

128mmol L-1)/26

d

128 mmol L-1/27

answer is C.

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Detailed Solution

30 min is equal to six times the half-life of 5 min. Hence, the concentration will be reduced by 26 times.

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