The lubricating action of an oil is more if it possess:-

(1) High vapour pressure

(2) low vapour pressure

(3) High surface tension

(4) High density

Subtopic:  Relative Lowering of Vapour Pressure |
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NEET 2023 - Target Batch - Aryan Raj Singh
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When 0.1 m CH3COOH is present in a solvent it shows elevation in boiling point of 0.75°C. Acid dissociation constant will be -(Kb=5 K Kg mol-1) (1M =1m)

(1) 5 X 10-2

(2) 5 X 10-3

(3) 10-2

(4) 10-3 

Subtopic:  Van’t Hoff Factor |
 62%
From NCERT
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NEET 2023 - Target Batch - Aryan Raj Singh
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NEET 2023 - Target Batch - Aryan Raj Singh

Which of the following shows positive deviation from Raoult's law:

(i) Chloroform and acetone

(ii) Carbon disulphide and acetone

(iii) Ethanol and Acetone

(iv) Phenol and Aniline

(1) i and ii

(2) ii and iii

(3) i and iv

(4) ii and iv

Subtopic:  Raoult's Law |
 71%
From NCERT
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NEET 2023 - Target Batch - Aryan Raj Singh

A non-volatile solute is dissolved in water. If its degree of association is 50%. What will be its freezing point when the boiling point is 100.52°C. [Kb=0.52 K kg mol-1, Kf=1.86K kg mol-1]

1. -0.52 K

2. -0.52°C

3. -1.86°C

4. 275.01 K

Subtopic:  Depression of Freezing Point |
 73%
From NCERT
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NEET 2023 - Target Batch - Aryan Raj Singh
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NEET 2023 - Target Batch - Aryan Raj Singh

When 36 g of a solute having the emperical formula CH2O is dissolved in 1.2 kg of water, the solution freezes at -0.93°C. What is the molecular formula of solute (Kf=1.86 kg K mol-1)

(1) C2H4O

(2) C2H2O2

(3) C2H4O3

(4) C2H4O2

Subtopic:  Depression of Freezing Point |
 80%
From NCERT
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NEET 2023 - Target Batch - Aryan Raj Singh
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NEET 2023 - Target Batch - Aryan Raj Singh

If partial pressure of oxygen is 0.5 atm and K= 1.4 × 10-3 M/atm, then the amount of oxygen dissolved in 100 ml water at 298K is-

1. 22.4 mg 2. 22.4 g
3. 2.24 g 4. 2.24 mg
Subtopic:  Dalton’s Law of Partial Pressure |
From NCERT
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NEET 2023 - Target Batch - Aryan Raj Singh
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NEET 2023 - Target Batch - Aryan Raj Singh

A solute x when dissolved in solvent associates to form a pentamer. The value of van't hoff factor (i) for the solute will be:-

1. 0.5

2. 5

3. 0.2

4. 0.1

 

Subtopic:  Van’t Hoff Factor |
 64%
From NCERT
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What amount of CaCl2(i=2.47) is dissolved in 2L water so that its osmotic pressure is 0.5 atm at 27°C:-

(1) 13.42 g

(2) 19.24 g

(3) 8.834 g

(4) 1.820 g

Subtopic:  Osmosis & Osmotic Pressure |
 67%
From NCERT
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One litre aqueous solution of sucrose (molar mass = 342 g/mol) weighing 1015 g is found to record an osmotic pressure of 4.8 atm at 293K. What is the molality of the sucrose solution ? (R= 0.0821 L atm K-1 mol-1) :

(1) 0.84

(2) 0.21

(3) 0.42

(4) 0.63

Subtopic:  Osmosis & Osmotic Pressure |
 74%
From NCERT
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The total vapor of a solution of liquid A and liquid B is 600 torr. The mole fraction of component A in the liquid phase is 0.7 and in the vapor phase is 0.35. The vapor pressure of pure A and B are respectively

(1) 300 torr, 130 torr

(2) 1300 torr, 130 torr

(3) 300 torr, 1300 torr

(4) 300 torr, 300 torr

Subtopic:  Dalton’s Law of Partial Pressure |
 62%
From NCERT
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