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21.

Why is the elivation in boiling point of water different in the following solution?
(i) 0.1 molar NaCl solution.
(ii) 0.1 molar sugar solution.

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22. Why does the molality of solution remains unchanged with rise in temperature?

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23. 10 mL of liquid A was mixed with 10 mL of liquid B. The volume of the resulting solution was found to be 19.9 mL. What do you conclude?

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24. Define Henry's law about solubility of a gas in a liquid.

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Solution:
The process is exothermic, it means that there is + ve deviation because force of attraction between A-B is more than A-A or B-B.

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26. Why does sugar dissolve in water?

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27. Why sugar does not dissolve in Benzene?

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28. What temperature change is expected during the mixing of two liquids whose solution shows a negative deviation from Raoult’s law?

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29. When is value of Van’t Hoff factor more than one?

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30. Why does the boiling point of a solution exhibit negative deviation from the ideal behaviour?

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