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Question

For a first order reaction, t0.75 is 138.6 seconds. Its specific rate constant (in s1) is:

A
102
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B
104
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C
105
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D
106
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Solution

The correct option is A 102
We know that:
Half life for first order reaction =0.693k
and
t12=12×t0.75
0.693k=138.62
k=102

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