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Raoult's law for an ideal solution states that the vapour pressure of a component is
Aproportional to its mole fraction in the solution
Bindependent of composition (typical)
Cequal to its pure value
Dproportional to its mass fraction
Answer & Solution
Correct answer: A. proportional to its mole fraction in the solution
1. For an ideal solution: p_A = p_A° · x_A where x_A is mole fraction of A in the liquid.
2. Total vapour pressure follows additively for ideal mixtures.
3. Hence partial vapour pressure is proportional to mole fraction.
_Source: Maharashtra Balbharati Std XII Chemistry, Ch 2 "Solutions" §2.5_
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