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Q. No.
Consider the two statements:
Statement I:  At 20 °C, the molality of KCl solution is 'X' m, and on decreasing temperature to -10 °C molality remains unchanged.
Statement II:  On changing temperature mass remains unchanged.
 
1.  Both Statement I and Statement II are True.
2. Both Statement I and Statement II are False.
3.  Statement I is True, and Statement II is False.
4.  Statement I is False, and Statement II is True.
Subtopic:  Elevation of Boiling Point | Van’t Hoff Factor |
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Level 1: 80%+
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The values of van’t Hoff factors for KCl, NaCl and K2SO4 respectively are:

1. 2, 2 and 2 2. 2, 2 and 3
3. 1, 1 and 2 4. 1, 1 and 1

Subtopic:  Van’t Hoff Factor |
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Level 1: 80%+

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What is the van’t Hoff factor for a very dilute solution of \(Fe_ 2 (SO_ 4)_ 3\) ?
1. 9 

2. 5

3. 2 

4. 6

Subtopic:  Van’t Hoff Factor |
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Which one of the following electrolytes has the same value of van't Hoff's factor(i) as that of Al2(SO4)3 (if all are 100% ionised)? 
1. K2SO4

2. K3[Fe(CN)6]

3. Al(NO3)3

4. K4[Fe(CN)6]

Subtopic:  Introduction & Colligative properties | Van’t Hoff Factor |
 89%
Level 1: 80%+
NEET - 2015

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Which of the following has more relative lowering in vapour pressure at the same temperature
1. 0.1 M urea
2. 0.1 M NaCl
3. 0.1 M sucrose
4. 0.1 M CaCl2
Subtopic:  Relative Lowering of Vapour Pressure | Van’t Hoff Factor |
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Level 1: 80%+
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The degree of dissociation α of a weak electrolyte, AxBy is related to van't Hoff factor (i) by the expression :

1. α=i−1(x+y−1)

2. α=i−1x+y+1

3. α=x+y−1i−1

4. α=x+y+1i−1

Subtopic:  Van’t Hoff Factor |
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Level 1: 80%+
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The boiling points of 0.001 M aqueous solutions of NaCl, Na2SO4, K3PO4, and CH3COOH are compared. The correct order of their boiling points is:

1. \( \mathrm{CH}_{3} \mathrm{COOH}<\mathrm{NaCl}<\mathrm{Na}_{2} \mathrm{SO}_{4}<\mathrm{K}_{3} \mathrm{PO}_{4} \)
2. \( \mathrm{NaCl}<\mathrm{Na}_{2} \mathrm{SO}_{4}<\mathrm{K}_{3} \mathrm{PO}_{4}<\mathrm{CH}_{3} \mathrm{COOH} \)
3. \( \mathrm{CH}_{3} \mathrm{COOH}<\mathrm{K}_{3} \mathrm{PO}_{4}<\mathrm{Na}_{2} \mathrm{SO}_{4}<\mathrm{NaCl} \)
4. \( \mathrm{CH}_{3} \mathrm{COOH}<\mathrm{K}_{3} \mathrm{PO}_{4}<\mathrm{NaCl}<\mathrm{Na}_{2} \mathrm{SO}_{4} \)
Subtopic:  Van’t Hoff Factor |
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Consider the given two statements:
Assertion (A):           The value of Van't  Hoff factor (i) for ethanoic acid in benzene is less than unity.
Reason (R):  Molecules of ethanoic acid dimerizes in benzene due to hydrogen bonding.
 
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. Both (A) and (R) are False.
Subtopic:  Van’t Hoff Factor |
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What is the percent dissociation of SrCl₂ in a 0.01 M solution if its van’t Hoff factor is 1.8?

1. 70 
2. 55 
3. 40 
4. 80
Subtopic:  Van’t Hoff Factor |
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Level 1: 80%+
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Which of the following aqueous solutions exhibits the highest boiling point?
1. 1.0 M NaOH    2. 1.0 M \(Na_2SO_4~~~~~~\)
3. 1.0 M \(NH_4NO_3~~~~\) 4. 1.0 M KNO3
Subtopic:  Elevation of Boiling Point | Van’t Hoff Factor |
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