For a parallel reaction: If k 1 and k 2 are the rate constants for the disappearance of A as per reaction I and reaction II, and k 1 = 1 × 1 0 − 3 se c − 1 and k 2 = 2 × 1 0 − 3 se c − 1 . [As

Question

For a parallel reaction: If k 1 ​ and k 2 ​ are the rate constants for the disappearance of A as per reaction I and reaction II, and k 1 ​ = 1 × 1 0 − 3 se c − 1 and k 2 ​ = 2 × 1 0 − 3 se c − 1 . [Assume initially only A is present, then identify the option(s) which is (are) not correct.]

TestHub · Accepted Answer

(a) [ C ] [ B ] ​ = 2 k 2 ​ 3 k 1 ​ ​ = 4 × 1 0 − 3 3 × 1 0 − 3 ​ = 4 3 ​ (b) n A ​ = 1 − x − y , n B ​ = 3 x , n c ​ = 2 y At t → ∞ ; ( x + y ) → 1 ⇒ n Total ​ = 3 x + 2 y = x + 2 (lies between 2-3) ( c ) t 1/2 ​ ( A ) = 3 × 1 0 − 3 l n 2 ​ sec No. of half-lives in 693 sec = 0.693 693 ​ × 3 × 1 0 − 3 [ A ] t ​ = 2 3 [ A ] 0 ​ ​ (c) or (d) 226 n 1.13 × 1 0 3 ​ × 0.7 1 ​ × n × 244 = 1742.9 g

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Options:(select one or more)

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