Chemistry XII+ - Solutions 02

Question : 1

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Vapour pressure of liquid does not depend on

Options:

	Surface area
	Temperature
	Molecular force in liquid
	Boiling point of liquid

Solution :

Vapour pressure is independent of surface area.

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Question : 2

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Which of the following statement is incorrect according to Henry law?

Options:

	Volume of gas dissolved is dependent on pressure
	Mass of the gas dissolved depends on pressure
	Higher the mole fraction of gas in gaseous mixture, more the solubility of gas in liquid
	Higher the value of Henry constant (KH), lower the solubility of gas

Solution :

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Question : 3

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The value of Henry constant (K_H) depends on

Options:

	Nature of solvent
	Temperature
	Nature of gas
	All of these

Solution :

Solubility depends on nature of solvent, gas and temperature.

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Question : 4

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The solubility of solid in liquid is

Options:

	Exothermic process only
	Endothermic process only
	May be exothermic and endothermic
	Neither exothermic nor endothermic

Solution :

The process can be either exothermic or endothermic.

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Question : 5

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Henry law is applicable

Options:

	For gases which can dissociate in solution
	For gases which can form compound with solvent
	At low pressure and high temperature
	At high pressure and low temperature

Solution :

Henry law is applicable for ideal gas.

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Question : 6

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Effect of temperature on the vapour pressure of a liquid is explained by the equation

Options:

Solution :

Higher the temperature, higher the vapour pressure.

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Question : 7

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If a graph is plotted, partial pressure of HCl gas versus mole fraction of HCl in its solution in cyclohexane, then slope of the line is

Options:

	KH

Solution :

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Question : 8

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A solution containing non-volatile solute (B), then which of the following statement is incorrect?

Options:

	Vapour pressure of solution is higher than that of pure solvent
	Vapour pressure of solution is equal to the vapour pressure of solvent in solution
	Vapour pressure of solution is lower than vapour pressure of pure solvent
	Both (2) & (3)

Solution :

On adding non-volatile solute in liquid, vapour pressure decreases.

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Question : 9

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Which of the following gas has highest value of Henry constant (K_H)/K-bar at 298 K?

Options:

	Ar
	CO2
	CH4
	Formaldehyde

Solution :

K_H for a gas is inversely proportional to solubility.

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Question : 10

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The correct statement is

Options:

	At high altitude the partial pressure of oxygen is less than that at ground level
	To increase the solubility of CO2 in soft drinks, the bottle is sealed under high pressure
	Solubility of gas in liquid decreases with increase in temperature
	All of these

Solution :

Solubility of gas decreases with increase in temperature.