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Q.

The thermal decomposition of HCOOH is a first order reaction. The rate constant is 3.465 ×10−3S−1   at a certain temperature. How long will it take for 87.5%  of initial quantity of HCOOH to decompose?(log2=0.30)

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a

800 sec

b

400 sec

c

600 sec

d

200 sec

answer is B.

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