1. Define critical temperature (Tc). 2. CO2 cannot be liquified above

1.	1. Define critical temperature (Tc). 2. CO2 cannot be liquified above 31.1°C. Why?3. The critical temperatures of ammonia and carbon dioxide are 405.5 K and 304.10 K respectively. On cooling, which of these gases will liquify first? Justify.
Answer» 1. It is the highest temperature at which a gas can be liquified by applying external pressure. 2. The critical temperature (T_c) of CO₂ is 30.98°C. This is the highest temperature at which liquid CO₂ is observed. Above this temperature it is gas. 3. Ammonia. This is because, on cooling, critical temperature of ammonia will be reached first. Liquefaction of carbon dioxide will require more cooling.

1. Define critical temperature (Tc). 2. CO2 cannot be liquified above 31.1°C. Why?3. The critical temperatures of ammonia and carbon dioxide are 405.5 K and 304.10 K respectively. On cooling, which of these gases will liquify first? Justify.

Answer»

1. It is the highest temperature at which a gas can be liquified by applying external pressure.

2. The critical temperature (T_c) of CO₂ is 30.98°C. This is the highest temperature at which liquid CO₂ is observed. Above this temperature it is gas.

3. Ammonia. This is because, on cooling, critical temperature of ammonia will be reached first. Liquefaction of carbon dioxide will require more cooling.

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1. Define critical temperature (Tc). 2. CO2 cannot be liquified above 31.1°C. Why?3. The critical temperatures of ammonia and carbon dioxide are 405.5 K and 304.10 K respectively. On cooling, which of these gases will liquify first? Justify.

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