Class XI Chemistry States of Matter 1

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Question 1

Two liquids A and B form an ideal solution. When total pressure of this solution is 600 torr, the amount fraction of A in the vapour phase is 0.35 and in liquid phase is 0.70. The vapour pressure of pure A is

• A300 torr
• B1300 torr
• C200 torr
• D400 torr

Question 2

For which of the following parameters the structural isomers C₂H₅OH and CH₃OCH₃ would be expected to have the same values?
(Assume ideal behaviour)

• AHeat of vaporization
• BGaseous densities at the same temperature and pressure
• CBoiling points
• DVapour pressure at the same temperature

Question 3

Which one of the following statements is NOT true about the effect of an increase in temperature on the distribution of molecular speeds in a gas?

• AThe most probable speed increases
• BThe fraction of the molecules with the most probable speed increases
• CThe distribution becomes broader
• DThe area under the distribution curve remains the same as under the lower temperature

Question 4

The behaviour of a real gas is usually depicted by plotting compressibility factor Z versus P at a constant temperature. At high temperature and high pressure, Z is usually more than one. This fact can be explained by vander Waals equations when

• AThe constant a is negligible and not b.
• BThe constant b is negligible and not a.
• CBoth the constants a and b are negligible.
• DBoth the constant a and b are not negligible.

Question 5

A vessel has nitrogen gas and water vapour at a total pressure of 1 atm. The partial pressure of water vapour is 0.3 atm. When the contents of this vessel are transformed to another vessel having one third of the capacity of original vessel, completely at the same temperature, the total pressure of the system in the new vessel is

• A3.0 atm
• B1 atm
• C3.33 atm
• D2.4 atm

Question 6

An ideal gas expands in volume from 1×10^-3 m³ to 1×10^-2 m³ at 300 K against a constant pressure of 1×10⁵ Nm^-2. The work done is

• A-900 J
• B900 kJ
• C2780 kJ
• D-900 kJ

Question 7

Two closed bulbs of equal volume (V) containing an ideal gas initially at pressure p₁ and temperature T₁ are connected through a narrow tube of negligible volume as shown in the figure below. The temperature of one of the bulbs is then raised to T₂. The final pressure p_f is :

• A
• B
• C
• D

Question 8

What volume of hydrogen gas(in L) , at 273K and 1 atm pressure will be consumed in obtaining 21.6 g of elemental boron (atomic mass = 10.8) form the reduction of boron trichloride by hydrogen? (Using R=0.0821)

• A89.6
• B67.2
• C44.8
• D22.4

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