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Answer: Vapour pressure is related with the molecular weight, lower the molecular weight higher the vapour pressure. since CH 3 OH has less molecular weight as compare to C 2 H 5 OH thus CH 3 OH has higher vapour pressure than C 2 H 5 OH at the same temperature.

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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)?

Answer:

Vapour pressure is related with the molecular weight, lower the molecular weight higher the vapour pressure. since CH₃OH has less molecular weight as compare to C₂H₅OH thus CH₃OH has higher vapour pressure than C₂H₅OH at the same temperature.

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

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