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Q.

Critical temperature of H2O⋅NH3⋅CO2and O2 are 647k.405.6K,304.10K and 154.2 K respectively. If the cooling starts from 500 K to their critical temperature. the gas that liquefies first is

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a

H2O

b

NH3

c

CO2

d

O2

answer is B.

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Detailed Solution

Since the cooling starts from 500 K, so water is nm under consideration.As it is much easier to achieve 500 K from 405.6K.So,NH3 will get liquefied first.
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