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Q.

The time taken for 90% of a first order reaction to complete is_________ approximately.

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a

1.1 times that of half-life

b

2.2 time that of half-life

c

3.3 times that of half-life

d

4.4 times that of half-life

answer is C.

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Detailed Solution

t90%=2.303klog100100−90     ……….(I) t50%=2.303klog100100−50    ……….(II)Dividing t90%t50%=log10log2 ∴t90%=3.3t50%
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The time taken for 90% of a first order reaction to complete is_________ approximately.