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Q.

For the first order reaction A→B  , the half life is 30 min. The time taken for 75% completion of the reaction is ______min. (Nearest integer)
Given:  log 2=0.3010
            log 3=0.4771
            log 5= 0.6989

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answer is 60.

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Detailed Solution

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t75%=2t1/2=2×30=60

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