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Question

20% decomposition of H2O2 in the presence of acid requires 5 min. The time required for 50% decomposition in minutes is:

A
15.52
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B
1.552
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C
0.1552
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D
7.76
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Solution

The correct option is A 15.52
For a first order reaction, k=2.303tlogaax

k=2.3035log10080

=0.044637

But the half life period t1/2=0.693k

=0.6930.044637

=15.52min.

Option A is correct.

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