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Q. No.

The correct option for the value of vapour pressure of a solution at 45 °C with benzene to octane in a 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]
1. 336 mm of Hg
2. 350 mm of Hg
3. 160 mm of Hg
4. 168 mm of Hg

Subtopic:  Raoult's Law |
 76%
Level 2: 60%+
NEET - 2021
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For an ideal solution, the correct option is:

1. ∆mix G=0 at constant T and P

2. ∆mix S=0 at constant T and P

3. ∆mix V≠0 at constant T and P

4. ∆mix H=0 at constant T and P

Subtopic:  Raoult's Law |
 82%
Level 1: 80%+
NEET - 2019
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The correct statement regarding a solution of two components A and B exhibiting positive deviation from ideal behaviour is :

1. Intermolecular attractive force between A-A and B-B are stronger than those between A-B
2. ∆mixH = 0 at constant T and P
3. ∆mixV = 0 at constant T and P
4. Intermolecular attractive forces between A-A and B-B are equal to those between A-B
Subtopic:  Raoult's Law |
 86%
Level 1: 80%+
NEET - 2019
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The incorrect statement among the following for an ideal solution is:

1. \(\Delta H_{\text{Mix}}=0\)
2. \(\Delta U_{\text{Mix}}=0\)
3. \(\Delta P=P_{\text{obs.}}-P_{\text{(Calculated by Raoult's law)}}=0\)
4. \(\Delta G_{\text{Mix}}=0\)
Subtopic:  Raoult's Law |
 82%
Level 1: 80%+
NEET - 2016
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The positive deviations from Raoult’s law mean the vapour pressure is:

1. Higher than expected.
2. Lower than expected.
3. As expected.
4. None of the above

Subtopic:  Raoult's Law |
 86%
Level 1: 80%+
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Which graph represents the positive deviation of vapor pressure?

1.  2.
3. 4. None of the above
Subtopic:  Raoult's Law |
 89%
Level 1: 80%+
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Assertion (A): An ideal solution obeys Raoult's law.
Reason (R): In an ideal solution, solute-solute as well as solvent-solvent, interactions are similar to solute-solvent interactions.
 
1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true but (R) is not the correct explanation of (A).
3. (A) is true but (R) is false.
4. (A) is false but (R) is true.
Subtopic:  Raoult's Law |
 87%
Level 1: 80%+
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Negative deviation from Raoult's law is shown by-

1. Bromoethane and chloroethane
2. Ethanol and acetone
3. Chloroform and acetone
4. Benzene and toluene
Subtopic:  Azeotrope | Raoult's Law |
 82%
Level 1: 80%+
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Choose a false statement among the following:

1.  Raoult's law states that the vapour pressure of a component over a solution is proportional to its mole fraction.
2.  The osmotic pressure (\(\pi\)) of a solution is given by the equation \(\pi\)=MRT, where M is the molarity of the solution.
3.  The correct order of osmotic pressure for 0.10 M aqueous solution of each compound is
BaCl2 > KCl > CH3COOH > Sucrose.
4.  Two sucrose solutions of the same molarity prepared in different solvents will have the same depression in the freezing point. 

Subtopic:  Depression of Freezing Point | Raoult's Law |
 74%
Level 2: 60%+
JEE
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The vapour pressures of benzene and toluene in pure states are 700 mm of Hg and 600 mm of Hg respectively. If equal masses of benzene and toluene are mixed together then the total vapour pressure of the solution will be approximately:
1. 620 mm of Hg 2. 640 mm of Hg
3. 654 mm of Hg 4. 674 mm of Hg
Subtopic:  Raoult's Law |
 69%
Level 2: 60%+
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