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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%) and Nitrogen (2.6%). The weight which a 75kg person would gain if all  1H atoms are replaced by  2H atoms is 2.5x. Value of x is 

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answer is 3.

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Detailed Solution

% H = 10 % So weight due to  1H is 7.5 kg 
                                       Due to  2H is 15.0 kg 
Increase in weight = 7.5 kg  
x = 3

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