### Chemistry - State of Matter : Gaseous and Liquid States

#### Question - 1

The minimum pressure required to compress $500\ dm^3$ of air at 1 bar to $200\ dm^3$ at $30^o\ C$ is

• A 1 bar
• B 2.5 bar
• C 5 bar
• D 5.8 bar

#### Question - 2

A student forgot to add the reaction mixture to the round bottomed flask and $27^oC$ but instead he/she placed the flask on the flame.  After a lapse of time, he realised his mistake and using a pyrometer he found the temperature of the flask was $477^oC$.  What fraction of air would have been expelled out?

• A 1.1
• B 0.8
• C 0.65
• D 0.6

#### Question - 3

Which of the following graphs is not a straight line for an ideal gas?

• A V versus T (n and p constant)
• B T versus p (n and V constant)
• C p versus 1 / V (n and T constant)
• D n versus 1 / p (V and T constant)

#### Question - 4

A sample of a unknown gas is placed in a  2.5 L bulb at pressure of 360 torr and at a temperature of $22.5^oC$ and is found to weigh 1.6616 g.  What is the molecular weight of the gas?

• A 80 g
• B 64 g
• C 55 g
• D 34 g

#### Question - 5

The SI unit for the quantity $pV^2T^2/n$ is

• A $Nm^2\ K\ mol^{-1}$
• B $Nm^4\ K\ mol^{-1}$
• C $Nm^4\ K^2\ mol^{-1}$
• D $N^{-1}m^2\ K^2\ mol^{-1}$

#### Question - 6

The kinetic molecular theory of gases predicts pressure to rise as the temperature of a gas increases.  It is because

• A gas molecules collide more frequently with the container walls
• B gas molecules collide less frequently
• C gas molecules have less kinetic energy
• D gas molecules collide less energetically with container walls

#### Question - 7

He atom is two times heavier than a hydrogen molecule.  At 298 K, the average kinetic energy of the atom is

• A two times that of a hydrogen
• B same as that of a hydrogen molecule
• C one fourth that of a hydrogen molecule
• D half that of a hydrogen molecule

#### Question - 8

As the temperature increases, average kinetic energy of molecules increases.  What would be the effect of increase of temperature on pressure provided the volume is constant?

• A Increases
• B Decreases
• C Remains same
• D Becomes half

#### Question - 9

For a monoatomic gas, kinetic energy is E.  Its relation with $V_{rmx}$ velocity is

• A $v_{rms}=({2E\over m})^{1/2}$
• B $v_{rms}=({E\over m})^{1/2}$
• C $v_{rms}=({E\over 2m})^{1/2}$
• D $v_{rms}=({4E\over 3m})^{1/2}$

#### Question - 10

The ratio of root mean square velocity to average velocity of a gas molecule at a particular temperature is

• A 1 : 1.086
• B 2 : 1.86
• C 1.086 : 1
• D 2.086 : 1