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Calculate the rate of reaction for the c...

Calculate the rate of reaction for the change 2A→Products, when rate constant of the reaction is `2.1×10^ (−5)` time −1 and [A] 0 =0.2 M.

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The correct Answer is:
B
`t_(1//2)=(1)/(ka)=(1)/(0.5xx0.5)=4 min`
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