The variation of vapour pressure of different liquids with temperature is shown in Fig. 5.6.

(i) Calculate graphically boiling points of liquids A and B.
(ii) If we take liquid C in a closed vessel and heat it continuously. At what temperature will it boil?
(iii) At high altitude, atmospheric pressure is low (say 60 mm Hg). At what temperature liquid D boils?
(iv) Pressure cooker is used for cooking food at hill station. Explain in terms of vapour pressure why is it so?

Answers (1)

(i) Approximately, BP of A is 315K, and that of B is 345K.

(ii) As pressure is kept on increasing in the closed vessel, liquid C will not boil.

(iii) 313K is the temperature corresponding to 60 mm Hg.

(iv) Since atmospheric pressure is low at high altitude, water boils at low temperature on hills.

 

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