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} $
