Chemical Kinetics Question 46

Question: A Substance undergoes first order decomposition. The decomposition follows two parallel first order reactions as The percentage distribution of B and C are [Kerala PMT 2004]

Options:

A) 75% B and 25% C

B) 80% B and 20% C

C) 60% B and 40% C

D) 90% B and 10% C

E) 76.83% B and 23.17% C

Show Answer

Answer:

Correct Answer: E

Solution:

% distribution of $ B=\frac{K_1}{K_1+K_2}\times 100 $

$ =\frac{1.26\times {10^{-4}}}{1.26\times {10^{-4}}+3.8\times {10^{-4}}}\times 100 $

B%=76.83%

$ \text{Distribution of }C=\frac{K_2}{K_1+K_2}\times 100 $

$ =\frac{3.8\times {10^{-4}}}{1.26\times {10^{-4}}+3.8\times {10^{-4}}}\times 100 $

C%=23.17%



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