Ncert Exercises & Solutions

Isotherms of carbon dioxide at various temperatures are represented in figure. Answer the following questions based on this figure.

1. In which state will CO₂ exist between the points a and b at temperature T₁?

2. At what point will CO₂ start liquefying when temperature is T₁?

3. At what point will CO₂ be completely liquefied when temperature T₂?

4. Will condensation take place when the temperature is T₃?

5. What portion of the isotherm at T₁ represent liquid and gaseous CO₂ at equilibrium?

(i) In gaseous state, CO₂ will exist between the points a and b at temperature T₁.

(ii) At point b, the plot becomes linear, this shows the phase transition, i.e., liquification of CO₂ starts and at point c, it gets completely liquified.

(iii) Similarly, at temperature T₂, g is the point at which CO₂ will be completely liquified.

(iv) Condensation will not take place at T₃ temperature because T₃>T_c (critical temperature).

(v) Between b and c, liquid and gaseous CO₂ are in equilibrium.

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