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Solutions

Short Answer Type

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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Long Answer Type

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

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Short Answer Type

89. Define the following terms:
Mole fraction

Answer:
mole fraction can be defined as :

Mole fraction of a component =

$\frac{Number of moles of the component}{Total number of moles of all the components}$

for example
Mole fraction. The ratio of the moles of a component A to the total moles of the solution is called the mole fraction of A. It is denoted by symbol x. For a binary solution of components A and B Mole fraction of A = x_{A
$= \frac{Moles of A}{Total moles of solution} = \frac{n_{A}}{n_{A} + n_{B}}$}Mole fraction of B = x_{B
$= \frac{Moles of B}{Total moles of solution} = \frac{n_{B}}{n_{A} + n_{B}}$}