Statement I: The earth does not retain hydrogen molecules and helium atoms in its atmosphere, but does retain much heavier molecules, such as oxygen and nitrogen.
Statement II: Lighter molecules in the atmosphere have translational speed that is greater or closer to escape speed of earth.

Options

A. Statement I is True, Statement II is True: Statement II is a correct explanation for Statement I.
B. Statement I is True, Statement II is True: Statement II is Not a correct explanation for Statement I.
C. Statement I is True, Statement II is False.
D. Statement I is False, Statement II is True.

Answer

A

Explanation

From kinetic theory of gas `v=sqrt((3Rt)/M)`
So, for lighter gas molecules, `v` is greater which is enough to take these molecules away from the earth's atmosphere.