Chemistry In Everyday Life Ques 4
4. Which one of the following is employed as a tranquilizer drug?
[2010]
(a) Promethazine
(c) Naproxen
(b) Valium
(d) Mifepristone
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Answer:
Correct Answer: 4.(b)
Solution:
(d) $N=N_0\left(\frac{1}{2}\right)^n \text {; here, } \mathrm{N}=\frac{\mathrm{N}_0}{4}$
$ \frac{N_0}{4}=N_0\left(\frac{1}{2}\right)^n \Rightarrow\left(\frac{1}{2}\right)^n=\left(\frac{1}{2}\right)^2 \Rightarrow n=2 $
$ \text { Total time }(T)=n \times t _{1 / 2}=2 \times 15=30 \mathrm{hrs}$
BETA
