Alpha Question Bank for Medical: Chemistry>Chapter 8 - Solutions>Exercise 4>Q 60

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A solution containing $62 g$ ethylene glycol in $250 g$ water is cooled to $- 10 ° C$ . If $K_{f}$ for water is $1.86 K kg {mol}^{- 1}$ , the amount of water (in $g$ ) separated as ice is:

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Alpha Question Bank for Medical: Chemistry>Chapter 8 - Solutions>Exercise 4>Q 61

Which one of the following statements regarding Henry's law is not correct?

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Alpha Question Bank for Medical: Chemistry>Chapter 8 - Solutions>Exercise 4>Q 62

Liquids

A

and

B

form an ideal solution in the entire composition range. At

350 K,

the vapour pressure of pure A and pure B are

7 \times 10^{3} Pa

and

12 \times 10^{3} Pa

, respectively. The composition of the vapour in equilibrium with a solution containing 40 mole percent of A at this temperature is:

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Alpha Question Bank for Medical: Chemistry>Chapter 8 - Solutions>Exercise 4>Q 63

The elevation in boiling point for

1

molal solution of glucose is

2 K

. The depression in freezing point for

2

molal solution of glucose in the same solvent is

2 K .

The relation between

K_{b}

and

K_{f}

is:

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Alpha Question Bank for Medical: Chemistry>Chapter 8 - Solutions>Exercise 4>Q 64

K_{2} {HgI}_{4}

is

40 %

ionised in aqueous solution. The value of its van't Hoff factor

(i)

is:

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Alpha Question Bank for Medical: Chemistry>Chapter 8 - Solutions>Exercise 4>Q 65

The freezing point of a diluted milk sample is found to

- {0.2}^{o} C,

while it should have been

- {0.5}^{o} C,

for pure milk. How much water has been added to pure milk to make the diluted sample?

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Alpha Question Bank for Medical: Chemistry>Chapter 8 - Solutions>Exercise 4>Q 66

Molecules of benzoic acid

(C_{6} H_{5} COOH)

dimerise in benzene.

‘ w ’ g

of the acid dissolved in

30 g

of benzene shows a depression in freezing point equal to

2 K

. If the percentage association of the acid to form a dimer in the solution is

80

, then

" w "

is: (Given that

K_{f} = 5 kg {mol}^{- 1}

, Molar mass of benzoic acid

= 122 g {mol}^{- 1}

)

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Alpha Question Bank for Medical: Chemistry>Chapter 8 - Solutions>Exercise 4>Q 67

The freezing point of a

4 %

aqueous solution of

X

is equal to the freezing point of a

12 %

aqueous solution of

Y

. If the molecular weight of

X

is

A

, then the molecular weight of

Y

will be

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Alpha Question Bank for Medical: Chemistry>Chapter 8 - Solutions>Exercise 4>Q 68

Which of the following salts is the most basic in aqueous solution?