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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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$t_{75 %} = 2 t_{1 / 2} = 2 \times 30 = 60$

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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