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प्रश्न
Pressure exerted by saturated water vapour is called aqueous tension. What correction term will you apply to the total pressure to obtain pressure of dry gas?
उत्तर
Whenever a gas is collected over water, it is moist and saturated with water vapour which exerts their own pressure. The pressure due to water vapour is called aqueous tension. Thus, the total pressure of the gas \[\ce{P_{(moist gas)}}\] is
\[\ce{P_{moist gas} = P_{drygas}}\]
Thus P drygas is given as
\[\ce{P_{drygas} = P_{moist gas}}\] – aqueous tension. Hence, the correction term applied to the total pressure of the gas in order to obtain pressure of dry gas is \[\ce{P_{moist gas}}\] – aqueous tension.
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संबंधित प्रश्न
Atmospheric pressures recorded in different cities are as follows:
| Cities | Shimla | Bangalore | Delhi | Mumbai |
| p in N/m2 | 1.01 × 105 | 1.2 × 105 | 1.02 × 105 | 1.21 × 105 |
Consider the above data and mark the place at which liquid will boil first.
Which of the following changes decrease the vapour pressure of water kept in a sealed vessel?
(i) Decreasing the quantity of water
(ii) Adding salt to water
(iii) Decreasing the volume of the vessel to one-half
(iv) Decreasing the temperature of water
The variation of vapour pressure 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?
Which of the following has the dimension of ML0T–2?
