NEET PYQ Solutions | Previous Year Questions with Answers

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Topic Question Set

Q 1 :
The correct option for the value of vapour pressure of a solution at 45° C with benzene to octane in molar ratio 3 : 2 is

[At 45° C vapour pressure of benzene is 280 mm Hg and that of octane is 420 mm Hg. Assume ideal gas.] [2021]

350 mm of Hg
160 mm of Hg
168 mm of Hg
336 mm of Hg

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(4)

$P_{total} = p_{benzene} x_{benzene} + p_{octane} x_{octane}$

$= 280 \times \frac{3}{5} + 420 \times \frac{2}{5} = 168 + 168$

$= 336$ $mm$ $of$ $Hg$

Q 2 :
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 [2019]

1.18 atm
1.76 atm
1.176 atm
0.98 atm

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(3)

$p_{water vapour} = x_{water vapour} \times P_{total}$

$= 0.02 \times 1.2 = 0.024$ $atm$

$P_{total} = p_{water vapour} + p_{dry air}$

$1.2 = 0.024 + p_{dry air}$

$p_{dry air} = 1.2 - 0.024 = 1.176$ $atm$

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