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Raoult S Law Questions

Practice 16 Raoult S Law questions with detailed answers and explanations. Free MCQs, PYQs, and mock test questions for NEET, JEE, GATE, SSC and more.

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16
Total Questions
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1
Easy
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15
Medium
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0
Hard
Practice by Exam:Chemistry(15)CHEMISTRY(1)

About Raoult's Law — practice questions, PYQs & concepts

Raoult's Law is a frequently-tested topic on Chemistry, CHEMISTRY. ExamTest.live currently lists 16 Raoult's Law questions spanning previous-year papers from 2026 to 2026, each with worked solutions and a step-by-step explanation. Use the filters on this page to focus on a specific exam, difficulty level or year — every answer key is free, no sign-up required.

Raoult's Law weight in competitive exams

Across our Raoult's Law question bank, the largest sources are Chemistry (15) and CHEMISTRY (1). Click any exam chip above to drill down to that exam-specific question set.

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All Raoult S Law Questions(1–16 of 16)

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Q1mediummcqChemistryAIEEE2026
0% accuracy
Benzene and toluene form nearly ideal solutions. At , the vapour pressure of benzene is and that of toluene is . The partial vapour pressure of benzene at for a solution containing of benzene and of toluene in torr is:
Q2mediummcqChemistryAIEEE 20072026
0% accuracy
A mixture of ethyl alcohol and propyl alcohol has a vapour pressure of at . The vapour pressure of pure propyl alcohol is . If the mole fraction of ethyl alcohol is , its vapour pressure in pure state at the same temperature will be:
Q3easymcqCHEMISTRYNEET 20192026
The correct statement regarding a solution of two components A and B exhibiting positive deviation from ideal behaviour is:
Q4mediummcqChemistryNEET 2020 E12026
The mixture which shows positive deviation from Raoult’s law is:
Q5mediummcqChemistryNEET 20212026
The correct option for the value of vapour pressure of a solution at with benzene to octane in molar ratio is: [At vapour pressure of benzene is and that of octane is ]
Q6mediummcqChemistryAIEEE 20042026
Which of the following liquid pairs shows a positive deviation from Raoult’s law?
Q7mediummcqChemistryAIEEE2026
The vapour pressure of water at is . If of glucose () is added to of water at , the vapour pressure of the resulting solution will be:
Q8mediummcqChemistryAIEEE 20092026
A binary liquid solution is prepared by mixing n-heptane and ethanol. Which one of the following statements is correct regarding the behaviour of the solution?
Q9mediummcqChemistryAIEEE 20092026
Two liquids and form an ideal solution. At , vapour pressure of the solution containing of and of is . At the same temperature, if of is further added to this solution, vapour pressure of the solution increases by . Vapour pressure (in ) of and in their pure states will be, respectively:
Q10mediummcqChemistryAIEEE2026
On mixing, heptane and octane form an ideal solution. At , the vapour pressures of the two liquid components (heptane and octane) are and respectively. Vapour pressure of the solution obtained by mixing of heptane and of octane will be (molar mass of heptane and of octane ):
Q11mediummcqChemistryChemistry
2% accuracy
moles of liquid X and moles of liquid Y make a solution having a vapour pressure of . The vapour pressures of pure X and Y are and respectively. Which of the following is true regarding the described solution?
Q12mediummcqChemistryChemistry
0% accuracy
A solution has a 1 : 4 mole ratio of pentane to hexane. The vapour pressure of the pure hydrocarbons at 20°C are 440 mm of Hg for pentane and 120 mm of Hg for hexane. The mole fraction of pentane in the vapour phase would be :
Q13mediummcqChemistryChemistry
An aqueous solution is in . Which change will cause the vapour pressure of the solution to increase?
Q14mediummcqChemistryChemistry
Vapour pressure of chloroform () and dichloromethane () at are and respectively. Vapour pressure of the solution obtained by mixing of and of at the same temperature will be: (Molecular mass of and molecular mass of )
Q15mediummcqChemistryChemistry
and are the vapour pressure of pure liquid components and , respectively, of an ideal binary solution. If represents the mole fraction of component , the total pressure of the solution will be:
Q16mediummcqChemistryChemistry
Which of the following statements about the composition of the vapour over an ideal molar mixture of benzene and toluene is correct? Assume that the temperature is constant at . (Given vapour pressure data at : benzene , toluene )

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