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The most abundant elements by mass in th...

The most abundant elements by mass in the body of a healthy human adult are : Oxygen (61.4 %) , Carbon (22.9 %) , Hydrogen (10.0 %) and Nitrogen (2.6%) .
The weight which a 75 kg person would gain if all `""^(1) H` atoms are replaced by `""^(2) H` atoms is -

A

7.5 kg

B

10 kg

C

15 kg

D

37.5 kg

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