The most abundant elements by mass in the body of a healthy human adult are : Oxygen ( ); Carbon ( ), Hydrogen ( ); and Nitrogen ( ). The weight which a 75 kg person would gain if all atoms are replaced by atoms is :
- (A)15 kg
- (B)37.5 kg
- (C)7.5 kg✓ Correct
- (D)10 kg
Answer: (C)
Solution
Hydrogen makes up of the kg body, that is kg of . Replacing every protium by deuterium doubles the mass of that hydrogen to kg, a gain of kg.
JEE Main · 2017 · 02 Apr 2017 · Offline · Single correct option