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The variation of vapour of different liq...

The variation of vapour of different liquids with temperature is shown in figure
(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 ?

Text Solution

Verified by Experts

(i) Boiling point of `A=315` (approximately),
`B=345K` (approximately).
(ii) Liquid C will not boil in a closed vessel because pressure inside keeps on changing.
(iii) approximately 313 K
(iv) A liquid boils. When vapour pressure becomes equal to the atmospheric pressure. Water boils at low temperature on hills because atmospheric pressure is low. Therefore, cooking is not perfect. In a pressure cooker, the pressure inside increases and the liquid boils at a higher temperature.
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