Chemical Kinetics Question 218

Question: If a substance with half life 3 days is taken at other place in 12 days. What amount of substance is left now [AFMC 2005]

Options:

A) 1/4

B) 1/8

C) 1/16

D) 1/32

Show Answer

Answer:

Correct Answer: C

Solution:

$ T={t_{1/2}}\times n $ i.e. $ 12=3\times n\Rightarrow n=4 $

$ N=N_0{{( \frac{1}{2} )}^{n}}\Rightarrow \frac{N}{N_0}={{( \frac{1}{2} )}^{4}}=\frac{1}{16} $



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