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Q.

A first order reaction takes 40 min for 30% decomposition. Calculate t12 .

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a

17.69 min

b

7.77 min

c

77.65 min

d

27.69 min

answer is C.

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Detailed Solution

K=2.303tlogaax 

 K=2.30340log10070

K=0.0089

t12=0.693K=0.6930.0089=77.65min.    

 

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