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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?

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88. Define the term solution. How many types of solutions are formed? Write briefly about each type with an example.

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89. Define the following terms:
Mole fraction

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Answer:

Molality. The moles of the solute dissolved in one kilogram of the solvent is called the molality of the solution.
Moality = m =

\frac{Moles of B}{Mass of solvent in kg}

∵

Moles = \frac{Moles of B}{Molar mass of B} = \frac{ω_{B}}{M_{B}} m = \frac{ω_{B}}{M_{B} \times ω_{A}} where ω_{A} = Mass of solvent in kg .

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