Alpha Question Bank for Engineering: Chemistry>Chapter 8 - Solutions>Exercise-2>Q 29

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Earn 100

$1.22 g$ of a monobasic acid is mixed in $100 g$ of benzene. The boiling point of the solution increases by $0.13 º C$ with respect to pure benzene. Find the molecular mass of acid in benzene solvent (in $u$ u). Report your answer after dividing it by $100$ and round it off to nearest integer. ( $Kb$ of benzene $= 2.6 K kg {mol}^{- 1}$ ).

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Important Questions on Solutions

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Alpha Question Bank for Engineering: Chemistry>Chapter 8 - Solutions>Exercise-2>Q 30

1 g

of a monobasic acid dissolved in

200 g

of water lowers the freezing point by

0.186 º C

. On the other hand, when

1 g

of the same acid is dissolved in water to make the solution

200 mL

, this solution requires

125 mL of 0.1 M NaOH

for complete neutralization. Calculate

%

dissociation of acid.

(K = 1.86 \frac{K - kg}{mol})

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Alpha Question Bank for Engineering: Chemistry>Chapter 8 - Solutions>Exercise-2>Q 31

At

27 º C, a 1.2 %

solution

(weight / volume)

of glucose is isotonic with

4.0 g / litre

of solution of solute

X

. Find the molar mass of

X

, if the molar mass of glucose is

180 . (R = 0.082 L atm {mol}^{- 1} K^{- 1}

, Molar mass of glucose

= 180 g {mole}^{- 1}

).

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Alpha Question Bank for Engineering: Chemistry>Chapter 8 - Solutions>Exercise-2>Q 33

We have

100 mL

of

0.1 M KCl

solution. To make it

0.2 M,

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Alpha Question Bank for Engineering: Chemistry>Chapter 8 - Solutions>Exercise-2>Q 34

Which of the following concentration factors can be calculated if the

mole

fraction and density of an aqueous solution of

HCl

are known?

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Alpha Question Bank for Engineering: Chemistry>Chapter 8 - Solutions>Exercise-2>Q 36

According to Henry’s law, the partial pressure of gas

(P_{g}^{'})

is directly proportional to the

mole

fraction of gas in the dissolved state, i.e.,

P_{gas}^{'} = K_{H} . X_{gas}

where,

K_{H}

is Henry’s constant. Which are correct?

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Alpha Question Bank for Engineering: Chemistry>Chapter 8 - Solutions>Exercise-2>Q 38

Two liquids

X

and

Y

are perfectly immiscible. If

X

and

Y

have molecular masses in ratio

1 : 2,

the total vapour pressure of a mixture of

X

and

Y

prepared in weight ratio

2 : 3

should be

({Px}^{0} = 400

torr

,

P_{y}^{0} = 200

torr

):

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Alpha Question Bank for Engineering: Chemistry>Chapter 8 - Solutions>Exercise-2>Q 39

Which is/are true about ideal solutions?

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Alpha Question Bank for Engineering: Chemistry>Chapter 8 - Solutions>Exercise-2>Q 40

At

40 ° C

, vapour pressure in torr of methanol and ethanol solution is

P = 119 x + 135

where

x

is the mole fraction of methanol. Hence,