SSC MTS EXAM

Detailed explanation-1: -The six most common elements of life on Earth (including more than 97% of the mass of a human body) are carbon, hydrogen, nitrogen, oxygen, sulphur and phosphorus.

Detailed explanation-2: -Oxygen and hydrogen together with carbon are by far the most common elements in the body accounting for some 93 percent of the body’s total mass. Adding three more elements-Nitrogen, Calcium and Phosphorus accounts for 99 percent of the body ‘s mass.

Detailed explanation-3: -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 H1 atoms are replaced by H2 atoms is: Q.