NCERT Class XII Chemistry
Chapter - Chemical Kinetics
Questions with Solutions
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Question : 13
Total: 39
Calculate the half-life of the first order reaction from their rate constants given below :
(i) 200 s– 1
(ii) 2 min– 1
(iii) 4 year– 1
(i) 200 s
(ii) 2 min
(iii) 4 year
Solution:
Half-life period of a first order reaction is given by t 1 ∕ 2 =
,
hence
(i)t 1 ∕ 2 =
= 3.46 × 10 − 3 s
(ii)t 1 ∕ 2 =
= 0.346 m i n
(iii)t 1 ∕ 2 =
= 0.173
hence
(i)
(ii)
(iii)
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