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Question

In a first order reaction the concentration of reactant decreases from 800 mol/dm3 to 50 mol/dm3 in 2×104 s. The rate constant of reaction in s1 is:



A

2×104

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B

3.45×105

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C

1.386×104

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D

2×104

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Solution

The correct option is C

1.386×104


For a first order reaction,

kt=ln[A]0[A]


k=1tln [A]0[A]

                      =12×104ln 80050

                      =4 ln 22×104s1


=1.386×104s1


Chemistry

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