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Class 12th Chemistry || Menu
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Boiling and Freezing Points of Solutions, Class 12 Chemistry NCERT Solutions

1. There will be total 20 MCQ in this test.
2. Please keep a pen and paper ready for rough work but keep your books away.
3. The test will consist of only objective type multiple choice questions requiring students to mouse-click their correct choice of the options against the related question number.
4. No negative marking for incorrect choice.
5. Please click on “Finish the Test” when you want to exit.
6. All the best – Happy Studying

1. If 2 moles of sugar are dissolved in 1000g of water, the elevation in boiling point of the resulting solution is: (Kb = 0.52 K kg mol-1):
 
 
 
 

Question 1 of 20

2. The molal elevation constant is the elevation in boiling point of
 
 
 
 

Question 2 of 20

3. The colligative properties of a solution are
 
 
 
 

Question 3 of 20

4. The information that is/are needed to determine the molar mass of an unknown solute is/are
 
 
 
 

Question 4 of 20

5. What is the boiling point of a 3 molal aqueous solution if Kb is 0.512°C/m?
 
 
 
 

Question 5 of 20

6. Which of the following is a colligative property?
 
 
 
 

Question 6 of 20

7. Beckmann thermometers are used to measure
 
 
 
 

Question 7 of 20

8. What is the symbol for cryoscopic constant?
 
 
 
 

Question 8 of 20

9. Which formula correctly represents the relative lowering of vapour pressure?

Boiling and Freezing Points of Solutions Multiple Choice Questions for CBSE Class 12 Chemistry   Topperlearning
 
 
 
 

Question 9 of 20

10. A solution was made by dissolving 2 g of a solute in 100 g of acetone. The solution boiled at 56.95° C. The boiling point of pure acetone is 55.95° C, and the Kb =1.71°C/m. What is the molecular weight of the solute?
 
 
 
 

Question 10 of 20

11. The molal elevation constant is the ratio of the elevation in B.P to:
 
 
 
 

Question 11 of 20

12. Which of the two has lower freezing point, 2m NaCl or 5m NaCl aqueous solution?
 
 
 
 

Question 12 of 20

13. If the vapour pressure of pure solvent A is 17.5 mm and lowering of vapour pressure of solution formed by adding a non-volatile electrolyte is 0.0175 mm then what is the relative lowering of vapour pressure?
 
 
 
 

Question 13 of 20

14. Solvent X boils at 78.5 °C and at 82.3 °C when nonvolatile solute Y is added to it. What is Tb?
 
 
 
 

Question 14 of 20

15. Which of the following aqueous solution do you expect to have the lowest freezing point?
 
 
 
 

Question 15 of 20

16. The freezing point of a 0.05 molal solution of a non electrolyte in water is (Kf = 1.86 k kg mol-1)
 
 
 
 

Question 16 of 20

17. 4g of two non volatile solutes A and B are separately dissolved in 100g of a given solvent. Which of the two shows higher elevation in boiling point if molar mass of A is more than that of B?
 
 
 
 

Question 17 of 20

18. Relative lowering of vapour pressure is directly proportional to
 
 
 
 

Question 18 of 20

19. When common salt is dissolved in water:
 
 
 
 

Question 19 of 20

20. Camphor is used as solvent to determine the molecular mass of non-volatile solute by Rast method because for camphor
 
 
 
 

Question 20 of 20

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