Which of the following changes with a change in temperature?

(1) Mole fraction

(2) Formality

(3) %(W/W)

(4) Molality

Subtopic:  Concentration Terms & Henry's Law |
 75%
From NCERT
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When the solute is present in trace quantities the following expression is used

1. Gram per million

2. Nanogram percent

3. Microgram percent

4. parts per million

Subtopic:  Concentration Terms & Henry's Law |
 90%
From NCERT
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Increasing the temperature of an aqueous solution will cause

(1) Decrease in molality

(2) Decrease in molarity

(3) Decrease in mole fraction

(4) Decrease in % (w/w)

Subtopic:  Concentration Terms & Henry's Law |
 86%
From NCERT
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During depression in freezing point in a solution, the following are in equilibrium.

(1) liquid solvent, solid solvent

(2) liquid solvent, solid solute

(3) liquid solute, solid solute

(4) liquid solute, solid solvent

Subtopic:  Depression of Freezing Point |
From NCERT
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When the attraction between A — B is more than that of A-A and B— B, the solution will show deviation from Raoult’s law:

(1) Positive

(2) Negative

(3) No

(4) Cannot be Predicted 

Subtopic:  Relative Lowering of Vapour Pressure | Raoult's Law |
 80%
From NCERT
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The azeotropic mixture of water and ethanol boils at 78.15 oC. When this mixture is distilled, it is possible to obtain-

1. Pure H2O

2. Pure C2H5OH

3. Pure H2O as well as pure C2HOH

4. Neither H2O nor C2H5OH in their pure state 

Subtopic:  Azeotrope |
 66%
From NCERT
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The vant Hoff factor 'i' accounts for

1. the extent of dissociation of solute

2. the extent of dissolution of solute

3. the degree of decomposition of solution

4. degree of solubilization of solute

Subtopic:  Van’t Hoff Factor |
 74%
From NCERT
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The solution which has the lowest freezing point is 

(1) 0.1 M potassium nitrate

(2) 0.1 M aluminium sulphate

(3) 0.1 M potassium chloride

(4) 0.1 M potassium sulphate

Subtopic:  Van’t Hoff Factor |
 73%
From NCERT
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Maximum freezing point will be for 1 molal solution of assuming equal ionization in each case:

(1) [Fe(H2O)6]Cl3

(2) [Fe(H2O)5Cl] Cl2.H2O

(3) [Fe(H2O)4Cl2]Cl.2H2O

(4) [Fe(H2O)3Cl3].3H2O

Subtopic:  Van’t Hoff Factor |
 59%
From NCERT
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The number of moles of sodium hydroxide present in 2.5 L and 0.5 M aqueous solution will be

(1) 1.25

(2) 0.5

(3) 12.5

(4) 5

Subtopic:  Concentration Terms & Henry's Law |
 86%
From NCERT
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