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Short Answer Type

61. Why is boiling point elevated when a non-volatile solute is added?

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62. The osmotic pressure of polymers (Macro-molecules) are determined by osmotic pressure and not by other colligative properties. Explain.

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63. What happens when blood cells are placed in pure water?

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64. What are the factors on which the vapour pressure of a liquid depends?

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65. State the conditions under which the Raoult’s law holds good.

Answer:

The Raoult's law holds good on the following condition:
(i) the two volatile components of the solution form an ideal solution.
(ii) the solution containing non-volatile solute is very dilute.

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66. What are the different types of azetropes? Give one example of each.

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67. Give an example of a compound in which hydrogen bonding results in the formation of a dimer.

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68. State any two characteristics of an ideal solution.

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69. What are the value ΔH, ΔV and P_total for a solution showing negative deviation from identity? Give one example.

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70. If the membrane used in determination of osmotic pressure is slight leaking, how will it influence the measured value of osmotic pressure?

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