A first-order reaction was started with a decimolar solution of the reactant, 8 minutes and 20 seconds later its concentration was found to be M/100. So the rate of the reaction is
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a
2.303×10−5sec−1
b
2.303×10−4sec−1
c
4.606×10−3sec−1
d
2.606×10−5sec−1
answer is C.
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Detailed Solution
For first order reaction K=2.303tlogaa−xGiven: a=110=0.1M;a−x=1100=0.01M; t=500sec∴ K=2.303500log.10.01=2.303500log10 =2.303500=0.004606=4.6×10−3