Question

Assertion: The ratio $\frac{C_{p}}{C_{V}}$ is more for helium gas than for hydrogen gas.
Reason : Atomic mass of helium is more than that of hydrogen.

• A. If both the assertion and reason are true and reason explains the assertion.
• B. If both the assertion and reason are true but reason does not explain the assertion.
• C. If assertion is true but reason is false.
• D. If assertion is false but reason is true.

Answer 1

Answer: (B)

As helium is monoatomic and hydrogen is diatomic, so, helium has less number of degrees of freedom than hydrogen
$\therefore C_{p} / C_{v}$ is more tor helium than that of hydrogen
Assertion and reason as true but reason is not a correct explanation of assertion.