1.

The most abundant elements by mass in the body of a helthy 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 the .^(1)H atoms are replaced by .^(2)H atoms is

Answer»

7.5 kg
10 kg
15 kg
37.5 kg

Solution :As the human ADULT CONTAINS `10%` of `.^(1)H`,
`therefore .^(1)G" present"=(10)/(100)xx75=7.5kg`
If all `.^(1)H` were replaced by `.^(2)H`, i.e., each atom has double the weight now, then gain in weight = 7.5 kg (H now present will be 15 kg).


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