Alpha Question Bank for Medical: Chemistry>Chapter 8 - Solutions>Exercise 1>Q 69

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Relative decrease in vapour pressure of an aqueous $NaCl$ is $0.167$ . Number of moles of $NaCl$ present in $180 g$ of $H_{2} O$ is

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Important Questions on Solutions

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Alpha Question Bank for Medical: Chemistry>Chapter 8 - Solutions>Exercise 1>Q 70

An aqueous solution is

1.00

molal in

KI

. Which change will cause the vapour pressure of the solution to increase?

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Alpha Question Bank for Medical: Chemistry>Chapter 8 - Solutions>Exercise 1>Q 71

The vapour pressure of pure benzene

C_{6} H_{6}

at

50 ° C

is

268 torr .

How many moles of non-volatile solute per mole of benzene is required to prepare a solution of benzene having a vapour pressure of

167 torr

at

50 ° C

?

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Alpha Question Bank for Medical: Chemistry>Chapter 8 - Solutions>Exercise 1>Q 72

The vapour pressure of pure liquid

A

is

10 torr

and at the same temperature when

1 g

of

B

solid is dissolved in

20 g

of

A

, its vapour pressure is reduced to

9.0 torr

. If the molecular mass of

A

is

200 amu

, then the molecular mass of

B

is:

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Alpha Question Bank for Medical: Chemistry>Chapter 8 - Solutions>Exercise 1>Q 73

The vapour pressure of a solution of a non-volatile solute

B

in a solvent

A

is

95 %

of the vapour pressure of the solvent at the same temperature. If the molecular weight of the solvent is

0.3

times the molecular weight of the solute, what is the ratio of weight of solvent to solute?

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Alpha Question Bank for Medical: Chemistry>Chapter 8 - Solutions>Exercise 1>Q 74

The lowering of vapour pressure of

0.1 M

aqueous solution of

NaCl, {CuSO}_{4}

and

K_{2} {SO}_{4}

are:

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Alpha Question Bank for Medical: Chemistry>Chapter 8 - Solutions>Exercise 1>Q 75

The vapour pressure of water at room temperature is lowered by

5 %

by dissolving a solute in it, then the approximate molality of solution is:

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Alpha Question Bank for Medical: Chemistry>Chapter 8 - Solutions>Exercise 1>Q 76

The boiling point of

C_{6} H_{6}, {CH}_{3} OH, C_{6} H_{5} {NH}_{2}

and

C_{6} H_{5} {NO}_{2}

are

80 ° C, 65 ° C, 184 ° C

and

212 ° C

, respectively. Which one will show the highest vapour pressure at room temperature?

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Alpha Question Bank for Medical: Chemistry>Chapter 8 - Solutions>Exercise 1>Q 77

The vapour pressure of an ideal solution having

0.2

mole non-volatile solute and

0.8

mole solvent is

60 mm .

The vapour pressure of pure solvent at this temperature will be-