NEET Chemistry Chemical Kinetics Questions Solved

NEET - 2016

The rate of a first-order reaction is 0.04 mol L-1 s-1 at 10 sec and 0.03 mol L-1 s-1 at 20 sec after initiation of the reaction. The half-life period of the reaction is

(a) 34.1 s (b) 44.1 s (c) 54.1 s (d) 24.1 s

(d) Given, order of reaction = 1
Rate of reaction at 10 s = 0.04 mol L-1 s-1
Rate of reaction at 20 s = 0.03 mol L-1s-1

Half-lite period (t1/2) = ?
We have the equation for rate-constant 'k' in first
order reaction.

                      k=2.303tlogAtA0  =2.303105log0.040.03  = 2.303105×0.124k= 0.028 s-1 

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