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Q.

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  75kg person would gain if all  1H atoms are replaced by 2H   atoms as

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a

20 kg

b

7.5 kg

c

37.5 kg

d

25 kg

answer is C.

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Detailed Solution

10% of 75 kg = 7.5 kg
Gain in weight is 7.5 kg

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