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Question

Half - life of the reaction :H2O2(aq)H2O+12O2(g) is independent of initial concentration of H2O2. Volume of O2 gas after 20 minutes is 5L at 1 atm and 27C, and after completion of the reaction 50 L. The rate constant is :


A

120log 10 min1

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B

2.30320log 10 min1

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C

2.30320log 5045min1

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D

2.30320log 4550min1

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Solution

The correct option is C

2.30320log 5045min1


t12 is independent of initial concentration, a, for first order reaction.
x α Vt (=5L at t=20 minutes)a α V(=50L at completion)2.30320logaax=2.30320log5045


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