### Chemistry - States of Matter

#### Question - 1

Real gases approach ideal behaviour at

• A high temperature and low pressure
• B low temperature and low pressure
• C high temperature and high pressure
• D critical temperature

#### Question - 2

When the pressure gradient and temperature are held constant the rates of effusion of CO and N2 will be in the ratio

• A 1:2
• B 2:1
• C 1:1
• D 1:4

#### Question - 3

The product PV, where P and V represent pressure and volume respectively, is a unit of

• A force
• B energy
• C entropy
• D impulse

#### Question - 4

At a given temperature, volume, are pressure of a gas obeying van der Waals equation is

• A less than that of an ideal gas
• B more than trhat of an ideal gas
• C more or less depending on the nature of gas
• D equal to that of an ideal gas

#### Question - 5

The partial pressure of hydrogen in a flask containing 2 gm of hydrogen and 32 gm of SO2 is

• A 2/3rd of the total pressure
• B 1/6th of the total pressure
• C 1/8th of the total pressure
• D 1/9th of the total pressure

#### Question - 6

To which one of the following Dalton's law of partial pressure is not applicable?

• A SO2 and CO2 at room temperature
• B N2 and H2 at room temperature
• C SO2 and O2 at room temperature
• D HCl and NH3 at room temperature

#### Question - 7

Equal weights of methane and oxygen are mixed in any empty container at ${ 25 }^{ \circ }C$. The fraction of the total pressure exerted by oxygen is

• A 1/2
• B 2/3
• C 1/3
• D $1/3+{273\over 298}$

#### Question - 8

When the pressure is not too high the van der Waal's equation reduces to

• A PV = RT - a/V
• B PV = RT + Pb
• C PV = RT - a/V2
• D PV = RT

#### Question - 9

The temperature of a certain mass of a gas was increased from ${ 40 }^{ \circ }C\ to\ {41 }^{ \circ }C$ at constant pressure. The volume of the gas

• A will increase by 1/273 of its volume at 273 K
• B will increase by1/273of its volume at ${ 40 }^{ \circ }C$
• C will remain constant
• D will increase, but the increase in volume cannot be predicted

#### Question - 10

Which one of the following is not the characteristic of an ideal gas?

• A It obeys Boyle's law, Charle's law and Avogardo law
• B When a gas is allowed to expand in vacuum, a cooling effect is observed
• C The collisions between the molecular of a gas are elastic
• D There is no attraction between the molecules of a gas