Write two differences between ideal and non-ideal solutions.

Ideal solutions : An ideal solution is the solution which obeys Raoult's law perfectly over entire range of concentration and temperature and during its formation there is no change in its enthalpy and volume. Such solutions are formed by mixing the two components which are identical in molecular size, in structure and have almost identical intermolecualr forces. Examples of ideal solution:- Chlorobenzene and bromobenzene; Benzene and toluene; Ethyl bromide and ethyl iodide. Non-ideal solutions : Those solutions which do not obey Rault's law are called non-ideal solutions. Non ideal solutions are formed when the components differ much in their structures and polarities. Non ideal solutions show either positive or negative deviations from Rault's law. Examples of non-ideal solution :- Ethanol and cyclohexane; Acetone and benzene; Water and methanol.

E M B I B E

NEW SYSTEMATIC MODERN CHEMISTRY>Chapter 2 - Solutions>REVIEW EXERCISES>Q 15

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IMPORTANT

Earn 100

Which is not affected by temperature?

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Important Questions on Solutions

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IMPORTANT

NEW SYSTEMATIC MODERN CHEMISTRY>Chapter 2 - Solutions>REVIEW EXERCISES>Q 16

A

5 %

solution of cane sugar (mol. wt.

= 342

) is isotonic with

1 %

solution of substance

X .

The molecular weight of

X

is

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IMPORTANT

NEW SYSTEMATIC MODERN CHEMISTRY>Chapter 2 - Solutions>REVIEW EXERCISES>Q 17

The vapour pressure of a solvent decreases by

10 mm

of mercury when a non-volatile solute was added to the solvent. The mole fraction of the solute in the solution is

0.2 .

What should be the mole fraction of the solvent if the decrease in vapour pressure is to be

20 mm

of mercury?

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IMPORTANT

NEW SYSTEMATIC MODERN CHEMISTRY>Chapter 2 - Solutions>REVIEW EXERCISES>Q 18

An aqueous solution freezes at

- 0.186 ° C (K_{f} = 1.86 °; K_{b} = 0.512 °) .

What is the elevation in boiling point?

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IMPORTANT

NEW SYSTEMATIC MODERN CHEMISTRY>Chapter 2 - Solutions>REVIEW EXERCISES>Q 19

The Van't Hoff factor for

0.1 M Ba {({NO}_{3})}_{2}

solution is

2.74 .

The degree of dissociation is

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NEW SYSTEMATIC MODERN CHEMISTRY>Chapter 2 - Solutions>REVIEW EXERCISES>Q 20

If

m

is the normal molecular weight and

x

is the degree of dissociation of

K_{4} [Fe (CN)_{6}]

then the abnormal molecular weight in the solution of salt will be

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IMPORTANT

NEW SYSTEMATIC MODERN CHEMISTRY>Chapter 2 - Solutions>REVIEW EXERCISES>Q 21

Which of the following units is useful in relating concentration of solution with its vapour pressure?

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NEW SYSTEMATIC MODERN CHEMISTRY>Chapter 2 - Solutions>REVIEW EXERCISES>Q 22

On dissolving sugar in water at room temperature, solution feels cool to touch. Under which of the following cases dissolution of sugar will be most rapid?

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IMPORTANT

NEW SYSTEMATIC MODERN CHEMISTRY>Chapter 2 - Solutions>REVIEW EXERCISES>Q 23

At equilibrium, the rate of dissolution of a solid solute in a volatile liquid solvent is