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Assertion: All colloidal dispersions giv...

Assertion: All colloidal dispersions give very low ormotic pressure and show very small freezing point depression or boiling point elevation.
Reason: Tyndall effect is due to scattering of light from the surface of colloidal particles.

A

If both assertion and reason are true and the reason is the correct explanation of the assertion.

B

If both assertion and reason are true and the reason is not the correct explanation of the assertion.

C

If assertion is true but reason is false.

D

If assertion is false but reason is true.

Text Solution

Verified by Experts

The correct Answer is:
B
Colloidal particles have high molar mass, so their mole fraction is very less causing low colligative prooperties.
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Statement-1:All colloidal dispersions give very low osmotic pressure and show very small freezing point depression or boiling point elevation. Statement-2:Tyndall effect is due to scattering of light from the surface of colloidal particles.

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Colligative properties i.e., the properties of solution which depend upon the particles present in solution are osmotic pressure, depression in freezing point, elevation in boiling point and relative lowering of vapour pressure. Experimental values of colligative properties for electrolytes are always higher than those obtained theoreticallu. The ratio of experimental colligative properties to theoretical colligative properties is called as van't Hoff factor (i). If equal volume of 0.01 M Ma OH is added in the solution of above weak acid solution then what will be new observed osmotic pressure at same temperature? Neglect the hydrolysis, dissociation of water and any volume concentration or expansion. Assume 10% dissociation of salt formed.

The boiling point elevation and freezing point depression of solutions have a number of partical applications. Ethylene glycol (CH_(2)OH-CH_(2)OH) is used in automobile radiatiors as an antifreeze because it lowers the freezing point of the coolant. The same substance also helps to prevent the radiator coolant from boiling away by elevating the boiling point. Ethylene glycol has low vapour pressure. We can also use glycerol as an antifreeze. In order for the boiling point elevation to occur, the solute must be non-volatile, but no such restriction applies to freezing point depression. For example, methanol (CH_(3)OH) , a fairly volatile liquid that boils only at 65^(@)C , is sometimes used as an antifreeze in automobile radiators. Which of the following is a better reagent for depression in freezing point but not for elevation in boiling point?

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