Question

Assertion: Gram molecular weight of ${O_2}$ is $32$
Reason: Relative atomic weight of oxygen is $32\;amu$
A.Both assertion and reason are correct and reason is correct explanation for assertion
B.Both assertion and reason are correct but reason is not the correct explanation for assertion.
C.Assertion is correct but reason is incorrect
D.Assertion is incorrect but reason is correct

Answer 1

Oxygen is the chemical element with the symbol $O$ and atomic number 8. It is a member of the chalcogen group in the periodic table, a highly reactive nonmetal, and an oxidizing agent that readily forms oxides with most elements as well as with other compounds.

Complete answer:
Gram-Molecular Weight. The mass, in grams, of one mole of a molecular compound is called the gram-molecular weight. It is numerically equal to the molecular weight. For example, one gram-molecular weight of molecular oxygen, oxygen (molecular weight approximately $32$), is $32$ grams.
Atomic mass is equal to the number of protons $+$ number of neutrons in the atom so in oxygen eight protons and eight neutrons are present therefore $8 + 8 = 16$.
So, the correct answer is (C) assertion is correct but reason is incorrect.

Additional information: Common uses of oxygen include production of steel, plastics and textiles, brazing, welding and cutting of steels and other metals, rocket propellant, oxygen therapy, and life support systems in aircraft, submarines, spaceflight and diving.

Note:
Oxygen being the first member of the sixteenth group has some different properties. This different behavior arises due to small size, high electron density and high electronegativity. It is known as the most electronegative atom in the periodic table after fluorine.