Biology NEET Previous Year Question Paper NEET 2019 Previous Year Question Paper Single Correct MCQ
Published on: August 21, 2026

In water saturated air, the mole fraction of water vapour is 0.02. If the total pressure of the saturated air is 1.2 atm, the partial pressure of dry air is

A
0.98atm
B
1.18 atm
C
l.76atm
D
l.176atm

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Text Solution

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The correct answer is:

                    

Mole fraction of water vapour = 0,02

Mole fraction of dry air = 1 – 0.02 = 0,98

Total pressure of saturated air = 1.2 atm

Using Dalton's law of partial pressure,

PX Dry air =P Total X Dry ari = 1.2 x 0.98

= 1.176 atm

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