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

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Two liquids $A$ and $B$ are miscible over the whole range of composition and may be treated as ideal (obeying Raoult's law.) At $350 K$ the vapour pressure of pure $A$ is $24.0 kPa$ and of pure $B$ is $12.0 kPa .$ $A$ mixture of $60 %$ A and $40 %$ $B$ is distilled at this temperature. A small amount of the distillate is collected and and redistilled at $350 K;$ what is the mole percent of $B$ in the second distillate ?

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Alpha Question Bank for Engineering: Chemistry>Chapter 8 - Solutions>Exercise-4>Q 69

Determine

i

(vant-Hoff factor) for a tribasic acid

H_{3} A .

Assuming first dissociation to be

100 %,

second dissociation

50 %,

third dissociation

20 %,

(Round off your answer to nearest integer).

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Alpha Question Bank for Engineering: Chemistry>Chapter 8 - Solutions>Exercise-4>Q 70

Dry air was successively passed through a solution of

5 g

solute in

80 g

water and then through pure water. The loss in weight of solution was

2.5 g

and that of pure water was

0.04 g .

What is mol. wt of solute?

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Alpha Question Bank for Engineering: Chemistry>Chapter 8 - Solutions>Exercise-4>Q 72

The diagram given below represents boiling point composition diagram of solution of components $A$ and $B,$ which is/are incorrect among the following?

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Alpha Question Bank for Engineering: Chemistry>Chapter 8 - Solutions>Exercise-4>Q 73

For a dilute solution having molality

m

of a given solute in a solvent of molecular weight

M

, boiling point

T_{b}

and heat of vaporisation per mole

∆ H; {[\frac{\partial T_{b}}{\partial m}]}_{m \to 0}

is equal to:

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Alpha Question Bank for Engineering: Chemistry>Chapter 8 - Solutions>Exercise-4>Q 74

Assuming each salt to be

90 %

dissociated which of the following will have highest osmotic pressure?

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Alpha Question Bank for Engineering: Chemistry>Chapter 8 - Solutions>Exercise-4>Q 75

The phase diagrams for the pure solvent (solid lines) and the solution (non-volatile solute, dashed line) are recorded below: The quantity indicated by $L$ in the figure is:

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Alpha Question Bank for Engineering: Chemistry>Chapter 8 - Solutions>Exercise-4>Q 76

Available are

1 L

of

0.1 M NaCl

and

2 L of 0.2 M {CaCl}_{2}

solutions. Using only these two solutions, what maximum volume of a solution can be prepared having

[{Cl}^{-}] = 0.34 M

exactly. Both electrolytes are strong.

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Alpha Question Bank for Engineering: Chemistry>Chapter 8 - Solutions>Exercise-4>Q 77

A teacher one day pointed out to his students the peculiar fact that water is a unique liquid which freezes exactly at

0 ° C

and boils exactly at

100 ° C

. He asked the students to find the correct statement based on this fact.