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81. 50 mL of a liquid A when mixed with 50 mL of liquid B, the resulting volume is 100.5 ml. What do you think about nature of solution?

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82. Mention two biological phenomena regulated by osmosis in plants and animals.

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83. What happens if pressure greater than osmotic pressure is applied on the solution separated by a semi-permeable membrane from the solvent?

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84. 10 mL of a liquid A was mixed with 10 mL of liquid B. The volume of resulting solution was found to be 19.9 mL. What do you conclude?

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85. Ethanol is an organic compound, yet it is freely miscible with water. Why?

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86. In cold countries, ethylene glycol is added to water radiators of cars during winter. Why?

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87. What is a semi-permeable membrane?

Answer:

A membrane is a thin layer that may or may not allow particles to pass through it. Permeable is defined as a membrane that can be crossed by particles, ions, or water.
Semi permeable means, It is a membrane which permits the solvent molecules but not solute molecules to pass through it from a dilute solution to concentrated solution. Example: A film of gelatinous precipitate of cupric ferrocyanide, Cu[Fe(CN)₆].

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