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Q.

If the concentration of a reactant decreases from 800 mol dm-3 to 50 mol dm-3 in 2×105 sec., in a first order reaction, the rate constant of the reaction would be ___?

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a

2×10-5s

b

1.386×10-5s-

c

3.45×10-5s

d

2×105s

answer is B.

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Detailed Solution

for the first order reaction, we havek=2.3030tlog[A]0[A]t=2.3032×105 log 80050=1.386×10-5s-

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If the concentration of a reactant decreases from 800 mol dm-3 to 50 mol dm-3 in 2×105 sec., in a first order reaction, the rate constant of the reaction would be ___?