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Solutions

Short Answer Type

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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25. A and B liquids on mixing produced a warm solution. Which type of deviation is there and why?

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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?

Answer:
The boiling point of a solution exhibit negtive deviation from the behaviour Because there is an increase in vapour pressure of the solution. So less energy is not required to equalise the vapour pressure to that of atmospheric pressure.

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