The half-life of a reaction is 50 minutes at a certain initial concentration. When the concentration is reduced to one-half, the half-life is found to be 25 minutes. The order of the reaction is:
A
Zero
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B
One
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C
Two
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D
Three
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Solution
The correct option is A Zero We know that half life for nth order reaction ∝[A]1−n
For n=0, t1/2∝[A]1
Hence, as the initial concentration increases, the half life increases. We can also say that as the initial concentratin decreases, the half life decreases proportionally.