Chemical Kinetics Question 298

Question: The reaction $ L\xrightarrow{{}}M $ is started with 10.0 g of L. After 30 and 90 minutes 5.0 g and 1.25 g of L respectively are left. The order of the reaction is

Options:

A) 0

B) 1

C) 2

D) 3

Show Answer

Answer:

Correct Answer: B

Solution:

[b] After every 30 minutes the amount is reduced to $ \frac{1}{2} $ therefore $ {t_{1/2}} $ is 30 minutes.

In 90 minutes the amount is reduced to $ \frac{1}{8} $ i.e. $ \frac{1}{2^{n}} $ . Here n = 3. True for 1st order reaction.



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