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 Multiple Choice QuestionsShort Answer Type

121. A peeled egg when dipped in water swells, while in saturated salt solution it shrinks. Why?
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122. Suggest the most important type of intermolecular attractive interaction in the following pairs.
(i) n-hexane and n-octane.
(ii) I2 and CCl4.
(iii) NaCl O4 and water.
(iv) methanol and acetone.
(v) acetonitrite (CH3 CN) and acetone (C3H6O).


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123. Based on solute-solvent interactions, arrange the following in order of increasing solubility in n-octane and explain cyclohexane, KCl, CH3OH, CH3CN.
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124. The depression in freezing point of water observed for the same amount of acetic acid, trichloroacetic acid and trifluoroaacetic acid increases in the order given. Explain briefly.
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125.

Vapour pressures of pure acetone and chloroform at 328 k are 741.8 nm Hg and 632.8 mm Hg respectively. Assuming that they form ideal solution over the entire range of composition, plot Ptotal , Pchlroform and Pacelone as a function of Xactone. The experimental date observed for different composition of mixture is:

100 x xacetone

0

11.8

23.8

36.0

50.8

58.2

64.5

72.1

Pacetone / mm Hg

 

0

54.9

110.1

202.4

327.7

405.9

454.1

521.1

Pchloroform/ mm Hg

632.8

548.1

469.4

359.7

257.7

193.6

161.2

120.7

Plot this data also on the same graph paper, indicate whether it has positive deviation or negative deviation from the ideal solution.

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 Multiple Choice QuestionsLong Answer Type

126. State Raoult’s law for solutions of volatile liquid components. Taking a suit example, explain the meaning of positive deviation from Raoult’s law.
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 Multiple Choice QuestionsShort Answer Type

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127. State the law co-relating the pressure of a gas and its solubility in a liquid. State an application of this law.


Answer:

Henry’s law states that the solubility of a gas in a liquid is directly proportional to pressure of the gas keeping temperature constant.
Mathematically, P = KH x
x mole fraction of gas in solution
P is partial pressure of gas,
KH is Henry's constant.

Applications: Henry's law finds various applications in industry and enables us to explain and understand some biological phenomena. The some of important applications are: COsolubility in soft drinks, beverages, soda water etc. is increased by applying high pressure and bottles are sealed under high pressure.

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 Multiple Choice QuestionsLong Answer Type

128. Define the term “osmotic pressure”. Describe how the molecular mass of a substance can be determined on the basis of osmotic pressure measurement.
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 Multiple Choice QuestionsShort Answer Type

129. Concentrated nitric acid used in the laboratory work is 68% nitric acid by mass in aqueous solution. What should be molarity of such sample of the acid if the density of solution is 1.504 g mL–1?
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 Multiple Choice QuestionsLong Answer Type

130. A solution of glucose in water is labelled as 10% W/W, what would be the molality and mole fraction of each component in the solution? If the density of the solution is 1.2 g mL–1, then what shall be the molarity of the solution? 
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