# UNIT 6: Gaseous State - Online Test

Q1. Gases deviate from ideal behavior at high pressure. Which of the following statement(s) is correct for non-ideality?
Explaination / Solution:
No Explaination.

Q2. Rate of diffusion of a gas is
Explaination / Solution:
No Explaination.

Q3. Which of the following is the correct expression for the equation of state of van der Waals gas?
Explaination / Solution:
No Explaination.

Q4. When an ideal gas undergoes unrestrained expansion, no cooling occurs because the molecules
Explaination / Solution:
No Explaination.

Q5. Equal weights of methane and oxygen are mixed in an empty container at 298 K. The fraction of total pressure exerted by oxygen is
Explaination / Solution:

mass of methane

= mass of oxygen = a

number of moles of methane = a/16

number of moles of Oxygen = a/32

mole fraction of Oxygen =

=[a/32] / [{a/16} + {a/32{ ]

= [a/32] / [3a/32]

=1/32

Partial pressure of oxygen

= mole fraction Total Pressure

=1/3 P

Q6. The temperatures at which real gases obey the ideal gas laws over a wide range of pres-sure is called
Explaination / Solution:

The temperature at which real gases obey the ideal gas laws over a wide range of pressure is called Boyle temperature

Q7. In a closed room of 1000 m3 a perfume bottle is opened up. The room develops a smell. This is due to which property of gases?
Explaination / Solution:
No Explaination.

Q8. A bottle of ammonia and a bottle of HCl connected through a long tube are opened simultaneously at both ends. The white ammonium chloride ring first formed will be
Explaination / Solution:

Rate of diffusion α 1/√m

mNH3 = 17 ; mHCl = 36.5

γNH3 > γHCl

Hence white fumes first formed near hydrogen chloride

Q9. The value of universal gas constant depends upon
Explaination / Solution:
No Explaination.

Q10. The value of the gas constant R is
Explaination / Solution:
No Explaination.