Question

# Critical temperature of H2O,NH3,CO2 and O2 are 647K,405.6K,304.10K and 154.2K respectively. If the cooling starts from 500K to their temperature, the gas that liquefies first is:

A
H2O
B
NH3
C
O2
D
CO2
Solution
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#### Critical Temperature of the gas in critical state, above which it cannot be liquefied by pressure. Here, cooling starts from 500 K to critical temperature. So, H2O will liquefied first due to it's maximum critical temperature value.

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