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  4. Assertion NH 3 is liquified more easily than CO 2. Reason Critical temperature of NH 3 is more than CO 2.

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Q. Assertion $NH _{3}$ is liquified more easily than $CO _{2}$.
Reason Critical temperature of $NH _{3}$ is more than $CO _{2}$.

Thermal Properties of Matter

Solution:

A gas can be liquified by applying pressure only when it is cooled below the critical temperature.
Critical temperature of $NH _{3}$ is more than $CO _{2}$,
i.e.$T_{ NH _{3}}=405 \,K$
and $ T_{ CO _{2}}=304.1 \,K .$
Hence, $NH _{3}$ is liquified more easily than $CO _{2}$.
Therefore, Assertion and Reason are correct and Reason is the correct explanation of Assertion.