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The critical temperatures of CO2 and CH4 gases are 31.1°C and -81.9°C. Which of the two has strong intermolecular forces and why ?

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The maximum temperature at which a gas can be converted into a liquid by an increase in pressure is called its critical temperature (TC). The liquification of a gas becomes easier with the increase in critical temperature, which means that the intermolecular forces of attraction between the molecules of a gas are directly proportional to its critical temperature. Here, the critical temperature for carbon dioxide is higher. Hence, intermolecular forces of attraction are stronger in the case of carbon dioxide.

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