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71. Why do doctors advice gargles of saline water in case of soring of throat?

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72. A person suffering from high blood pressure should take less common salt in the food. Why?

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73. What type of deviation (+ ve or – ve) is expected of a solution obtained by adding conc. H₂SO₄ to water?

Answer:
Adding conc. H₂SO₄ to water Heat is liberated in the process of dissolution, ΔH < 0. The solution formed will show negative deviation from Raoult’s law, A-B attractions > A-A and B-B attractions.

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74. Which process is used in large scale desalination of sea water?

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75. Which of the following has higher vapour pressure at same temperature: CH₃OH (b. p. 640.5⁰C) and C₂H₅OH (b.p. 78.3⁰C)?

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76. Why is the freezing point depressed when a non-volatile solute is dissolved in a liquid solvent?

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77. Which of the two has higher osmotic pressure: 1 M glucose solution or 1 M NaCl solution at the same temperature?

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78. Modify the equation ΔT_b = K_b m using Van’t Hoff factor.

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79. When a liquid A is mixed with liquid B, the resulting solution is found to be cooler. What do you conclude about the nature of the solution?

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80. What will happen to the value of colligative property of a solution if the weight of solute dissolved is doubled and weight of solvent taken is halved?

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Previous Year Papers

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Short Answer Type

73. What type of deviation (+ ve or – ve) is expected of a solution obtained by adding conc. H2SO4 to water?

73. What type of deviation (+ ve or – ve) is expected of a solution obtained by adding conc. H₂SO₄ to water?