## Real gases and Vander Waal's equation MCQ Basic Level

Compared to other sections, Chemistry is considered to be the most scoring section. If prepared thoroughly, chemistry can help students to secure a meritorious position in the exam. These questions are very important in achieving your success in Exams after 12th.

Q1. The Vander Waal's equation explains the behaviour of

•  Ideal gases
•  Real gases
•  Vapour
•  Non-real gases

Real gases

Q2. Gases deviate from the ideal gas behaviour because their molecules

•  Possess negligible volume
•  Have forces of attraction between them
•  Are polyatomic
•  Are not attracted to one another

Have forces of attraction between them

Q3. The compressibility factor of a gas is defined as Z = PV/RT . The compressibility factor of ideal gas is

•  0
•  Infinity
•  1
•  –1

1

Q4. The temperature at which the second virial coefficient of real gas is zero is called

•  Critical temperature
•  Eutetic point
•  Boiling point
•  Boyle's temperature

Boyle's temperature

Q5. When is deviation more in the behaviour of a gas from the ideal gas equation PV = nRT

•  At high temperature and low pressure
•  At low temperature and high pressure
•  At high temperature and high pressure
•  At low temperature and low high pressure

At low temperature and high pressure

Q6. Vander Waal's constants 'a' and 'b' are related with.....respectively

•  Attractive force and bond energy of molecules
•  Volume and repulsive force of molecules
•  Shape and repulsive forces of molecules
•  Attractive force and volume of the molecules

Attractive force and volume of the molecules

Q7. Gas deviates from ideal gas nature because molecules

•  Are colourless
•  Attract each other
•  Contain covalent bond
•  Show Brownian movement

Attract each other

Q8. The Vander Waal's equation reduces itself to the ideal gas equation at

•  High pressure and low temperature
•  Low pressure and low temperature
•  Low pressure and high temperature
•  High pressure and high temperature

Low pressure and high temperature

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