ICSE Chemistry>Chapter 2 - Solutions>OBJECTIVE (MULTIPLE CHOICE) TYPE QUESTONS>Q 53

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The freezing point depression constant for water is $- 1.86 ° C m^{_{- 1}}$ . If $5.00 g {Na}_{2} {SO}_{4}$ is dissolved in $45.0 g H_{2} O$ , the freezing point is changed by $- 3.82 ° C$ . Calculate the van't Hoff factor for ${Na}_{2} {SO}_{4}$ .

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Important Questions on Solutions

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12th ICSE

IMPORTANT

ICSE Chemistry>Chapter 2 - Solutions>OBJECTIVE (MULTIPLE CHOICE) TYPE QUESTONS>Q 54

p_{A}

and

p_{B}

are the vapour pressure of pure liquid components, A and B, respectively of an ideal binary solution. If

χ_{A}

represents the mole fraction of component A, the total pressure of the solution will be

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12th ICSE

IMPORTANT

ICSE Chemistry>Chapter 2 - Solutions>OBJECTIVE (MULTIPLE CHOICE) TYPE QUESTONS>Q 55

Of the following

0.10 m

aqueous solutions, which one will exhibit the largest freezing point depression?

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ICSE Chemistry>Chapter 2 - Solutions>OBJECTIVE (MULTIPLE CHOICE) TYPE QUESTONS>Q 56

Consider the separate solution of

0.50 M C_{2} H_{5} OH (aq .), 1.00 M {Mg}_{3} {({PO}_{4})}_{2} (aq .), 0.250 M KBr (aq .) and 0.125 M {Na}_{3} {PO}_{4} (aq .)

at

25 ° C

. Which statement is true about these solutions, assuming all salts are strong electrolytes?

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IMPORTANT

ICSE Chemistry>Chapter 2 - Solutions>OBJECTIVE (MULTIPLE CHOICE) TYPE QUESTONS>Q 57

The vapour pressure of acetone at

20 ° C

is

185 torr

. When

1.2 g

of a non-volatile substance was dissolved in

100 g

of acetone at

20 ° C

, its vapour pressure was

183 torr

. The molar mass

(g {mol}^{- 1})

of the substance is

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IMPORTANT

ICSE Chemistry>Chapter 2 - Solutions>OBJECTIVE (MULTIPLE CHOICE) TYPE QUESTONS>Q 58

18 g

glucose

(C_{6} H_{12} O_{6})

is added to

178.2 g

water. The vapour pressure of water (in torr) for the aqueous solution is

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ICSE Chemistry>Chapter 2 - Solutions>OBJECTIVE (MULTIPLE CHOICE) TYPE QUESTONS>Q 59

Consider the following liquid-vapour equilibrium:

$Liquid ⇌ Vapour$

Which of the following relation is correct?

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ICSE Chemistry>Chapter 2 - Solutions>OBJECTIVE (MULTIPLE CHOICE) TYPE QUESTONS>Q 60

Which of the following statements about the composition of the vapour over an ideal

1 : 1

molar mixture of benzene and toluene is correct? Assume that the temperature is constant at

25 ° C

. (Given, vapour pressure data at

25 ° C

, benzene

= 12.8 kPa,

toluene

= 3.85 kPa

)

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12th ICSE

IMPORTANT

ICSE Chemistry>Chapter 2 - Solutions>OBJECTIVE (MULTIPLE CHOICE) TYPE QUESTONS>Q 61

At

100 ° C

the vapour pressure of a solution of

6.5 g

of a solute in

100 g

water is

732 mm

. If

k_{b} = 0.52

, the boiling point of this solution will be