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

Answer:

Doctor advice gargle by saline water in case of sore throat. Relief is observed in sore throat by saline water due to osmosis process
Saline water is hypertonic solution. Therefore, fluids causing irritation in throat comes out with saline water.

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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?

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