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Question

The vapour pressure of a moist gas at $$100^{o}C$$ is $$750\ mm$$ and the aqueous tension at the same temperature is $$10\ mm$$. The vapour pressure of the dry gas is :


A
750 mm
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B
760 mm
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C
740 mm
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D
720 mm
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Solution

The correct option is C 740 mm
Some gases are collected over water in the laboratory. 

During collection, the gas gathers water vapours and becomes moist. 

The partial pressure exerted by the water vapours is called the aqueous tension.

Pressure of dry gas $$=$$ pressure of moist gas - aqueous tension

                                  $$= 750 - 10 = 740\: mm$$

Therefore, the option is C.

Chemistry

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