Consider the two different first order reactions given below A + B C (Reaction 1) P Q (Reaction 2) The ratio of the half life of Reaction 1 : Reaction 2 is 5 : 2. If t1 and t2 represent the time taken

Question

Consider the two different first order reactions given below A + B C (Reaction 1) P Q (Reaction 2) The ratio of the half life of Reaction 1 : Reaction 2 is 5 : 2. If t1 and t2 represent the time taken to complete rd and th of Reaction 1 and Reaction 2, respectively, then the value of the ratio t1 : t2 is________× 10–1 (nearest integer). [Given: log10(3) = 0.477 and log10(5) = 0.699]

Prashant Kotian · Accepted Answer

Correct answer: .. 1/2 I 1/2 II (t ) K (t ) K    K1t1 = n 2 3  = n3 K2t2 = n 4 5  = n5  1 2 K t 0.477 K t 0.699    2 t 0.477 t 0.699   = 1.7 = 17 × 10–1

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