van der Waal's constants b and the cor-responding values of critical tempera-ture for three gases P, Q and R, are given below Gas Critical van der Waal's temperature constant b P -200°C 0.03 l/mol Q -

Question

van der Waal's constants b and the cor-responding values of critical tempera-ture for three gases P, Q and R, are given below Gas Critical van der Waal's temperature constant b P -200°C 0.03 l/mol Q -100°C 0.02 l/mol R +50°C 0.01 l/mol Which of the gases are liquefiable at a temperature -110°C by application of increasing pressure?

Prashant Kotian · Accepted Answer

Correct answer: C. A gas can be liquefied by pressure if its temperature is below its critical temperature (T <= T_c). The given temperature is -110°C. For Q (-100°C) and R (+50°C), -110°C is below T_c, so they can be liquefied. For P (-200°C), -110°C is above T_c, so it cannot be liquefied .

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