# Given the Assertion and Reason below, Choose one of the following responses $\begin{array}{1 1}\text{Assertion:The ratio }\large\frac{C_P}{C_V}\normalsize \text{ is more for helium than hydrogen.}\\\text{Reason:Atomic mass of helium is more than hydrogen.}\end{array}$

$\begin{array}{1 1}(A)\;\text{Both assertion and reason are true and the reason is a correct explanation of the assertion}\\(B)\;\text{Both assertion and reason are true but reason is not a correct explanation of the assertion}\\(C)\;\text{Assertion is true but the reason is false}\\(D)\;\text{Both assertion and reason are false}\end{array}$

$\frac{C_P}{C_V}$ for helium is more than that of hydrogen because $He$ is a monoatomic gas and $H_2$ is diatomic gas. It does not depend on the atomic mass of the gases.
But atomic mass of $He$ is more than that of Hydrogen.
Both assertion and season are correct but reason is not a correct explanation of the assertion.
Hence (B) is the correct answer.
edited Feb 28