A) 15 kg
B) 37.5 kg
C) 7.5 kg
D) 10 kg
Correct Answer: C
Solution :
Mass in the body of a healthy human adult has:- Oxygen = 61.4%, Carbon = 22.9%, Hydrogen = 10.0% and Nitrogen = 2.6% Total weight of person = 75 kg Mass due to \[{{\,}^{\text{1}}}\text{H}\]is \[=75\times \frac{10}{100}=7.5\,kg\] \[{{\,}^{\text{1}}}\text{H}\]atoms are replaced by\[{{\,}^{2}}\text{H}\] atoms. So mass gain by person =7.5 kg
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