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Exam 2025 Chemistry question bank (Chemistry)

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Q1.

When a non-volatile solute is added to a solvent,the vapor pressure of the solvent decreases by $10 \ mm \ Hg$. The mole fraction of the solute in the solution is $0.2$. If the vapor pressure is to be decreased by $20 \ mm \ Hg$,what will be the mole fraction of the solvent?

(A)
$0.2$
(B)
$0.4$
(C)
$0.6$
(D)
$0.8$
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Q2.

When a non-volatile solute is added to a solvent,the vapor pressure decreases by $10 \ mm$. The mole fraction of the solute is $0.2$. If the vapor pressure decreases by $20 \ mm$,what will be the mole fraction of the solvent?

(A)
$0.8$
(B)
$0.6$
(C)
$0.4$
(D)
$0.2$
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