Chemistry In Everyday Life Ques 9
9. Mixture of chloroxylenol and terpineol acts as:
[2017]
(a) antiseptic
(c) antibiotic
(b) antipyretic
(d) analgesic
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Answer:
Correct Answer: 9.(c)
Solution:
(c) Given $t _{1 / 2}=12.3$ years
Initial amount $\left(N_0\right)=32 \mathrm{mg}$
Total time $=49.2$ years
No. of half lives $(n)=\frac{T}{t _{1 / 2}}=\frac{49.2}{12.3}=4$
Now $N_t=N_0\left(\frac{1}{2}\right)^n=32\left(\frac{1}{2}\right)^4=\frac{32}{16}=2 \mathrm{mg}$
Hence $32 \mathrm{mg}$ becomes $2 \mathrm{mg}$ in 49.2 years
BETA
