Question

Q.1- The half life of a substance in a first order reaction is 15 min. The rate constant is
(A) 2.46 x 102 min-1
(B) 6.74 x 10-2 min-1
(C) 4.62 x 10- 2 min - 1
(D) 7.18 x 102 min-1
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Answer 1

Answer:

I think the option c is a correct answer

Answer 2

half life of a first order rxn is given by the formula,

t1/2=0.693/k

k=0.683/15

k=0.0462

k=4.62×10^-2 min -1

the answer is c

I hope this helps ( ╹▽╹ )