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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?

Solution:
sugar dissolves in water because when a sucrose molecule breaks from the sugar crystal, it is immediately surrounded by water molecules. The sucrose has hydroxyl groups that have a slight negative charge.
The positive charge of the oxygen found in the water molecule binds with the sugar. As the hydration shell forms around the sucrose molecule, the molecule is shielded from other sugar molecules so the sugar crystal does not reform.

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