Q. No.Which of the following aqueous solutions should have the highest boiling point?
1. \(1.0~M~NaOH\)
2. \(1.0~M~Na_2SO_4\)
3. \(1.0~M~NH_4NO_3\)
4. \(1.0~M~KNO_3\)
1. \(1.0~M~NaOH\)
2. \(1.0~M~Na_2SO_4\)
3. \(1.0~M~NH_4NO_3\)
4. \(1.0~M~KNO_3\)
Subtopic: Elevation of Boiling Point | Van’t Hoff Factor |
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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%+
JEE
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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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Subtopic: Van’t Hoff Factor |
90%
Level 1: 80%+
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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 |
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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
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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JEE
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The degree of dissociation of a weak electrolyte, AxBy is related to van't Hoff factor (i) by the expression :
1.
2.
3.
4.
Subtopic: Van’t Hoff Factor |
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JEE
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The boiling point of 0.001 M aqueous solutions of NaCl, Na2SO4, K3PO4, and CH3COOH should follow the order-
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. \( \mathrm{CH}_{3} \mathrm{COOH}<\mathrm{K}_{3} \mathrm{PO}_{4}<\mathrm{NaCl}<\mathrm{Na}_{2} \mathrm{SO}_{4} \)
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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Level 1: 80%+
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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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Van't Hoff factor for \(SrCl_2\) at 0.01 M is 1.8. Percent dissociation of \(SrCl_2\) at this concentration is:
1. 70
2. 55
3. 40
4. 80
1. 70
2. 55
3. 40
4. 80
Subtopic: Van’t Hoff Factor |
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