The gas with the highest critical temperature is

H_{2}

H e

N_{2}

O_{2}

C O_{2}

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Critical temperature $(T)$ is the measure of intermolecular forces of attraction. The order of the critical temperature of the given gases is as
$\begin{matrix} T_{c} (K) \end{matrix} \begin{matrix} C O_{2} 304.2 K \end{matrix} \begin{matrix} > \end{matrix} \begin{matrix} O_{2} (154.3 K) \end{matrix} \begin{matrix} > \end{matrix} \begin{matrix} N_{2} (126.2 K) \end{matrix} \begin{matrix} > \end{matrix} \begin{matrix} H_{2} (33.2 K) \end{matrix} \begin{matrix} > \end{matrix} \begin{matrix} H e (5.2 K) \end{matrix}$

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The gas with the highest critical temperature is

Critical temperature (T) is the measure of intermolecular forces of attraction. The order of the critical temperature of the given gases is asTc(K)CO2304.2K>O2(154.3K)>N2(126.2K)>H2(33.2K)>He(5.2K)