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Heat and Work

Which is not ...

Question

Which is not a colligative property?

A

Osmotic pressure

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B

Lowering in vapour pressure

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C

Depression in freezing point

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D

Refractive index

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Solution

The correct option is D Refractive index
Colligative properties depend on how many solute particles are present as well as the solvent amount, but they do NOT depend on the type of solute particles.
Hence Refractive Index is not a colligative particles as it only depends on nature of materials.

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Q. Assertion :Osmotic pressure of

1 M

glucose is lesser than

1 M

N a C l (a q)

but vapour pressure of

1 M

glucose is higher than

1 M

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. Reason: Osmotic pressure is colligative property but vapour pressure is not colligative property however, lowering in V.P. is colligative property.

Q. Which is not a colligative property in the following ?

Q. Assertion :Lowering of vapour pressure is not dependent on the number of species present in the solution. Reason: Lowering of vapour pressure and relative lowering of vapour pressure are colligative properties.

Q. (A) Vapour pressure is a colligative property.
(R) Colligative property depends on the number of solute particles dissolved in the solution.

Q. The experimental values of colligative properties of many solutes in solution resembles calculated values of colligative properties.
However in some cases, the experimental values of colligative properties differ widely than those obtained by calculations. Such experimental values of colligative properties are known as abnormal values of colligative properties. The causes for abnormal values of colligative properties are:
(i) Dissociation of solute: It increases the colligative properties.
e.g.: Dissociation of

KCl, NaCl

H_{2} O

.
(ii) Association of solute: It decreases the colligative properties.
e.g.: Dimerisation of acetic acid in benzene.

One mole of

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