Chemical Kinetics Question 192

Question: 75% of a first order reaction was completed in 32 minutes when was 50% of the reaction completed [AMU 1999; Kerala (Med.) 2003]

Options:

A) 16 min.

B) 24 min.

C) 8 min.

D) 4 min.

Show Answer

Answer:

Correct Answer: A

Solution:

$ k=\frac{2.303}{t}\log ( \frac{a}{a-x} ) $

$ k=\frac{2.303}{32}\log ( \frac{100}{100-75} ) $ .- (i) $ k=\frac{2.303}{t}\log ( \frac{100}{100-50} ) $ -.(ii) from the two equation (i) and (ii), $ t=16 $ minutes.



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