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## Behaviour of Real Gases MCQs

**1. What is the temperature known as where a real gas obeys Boyle’s law or as an ideal gas?**

a) Boyle temperature

b) Charge temperature

c) Critical temperature

d) Absolute Temperature

**Answer: ** Boyle temperature

**2. Compressibility can be expressed as _______**

a) real volume divided by the ideal volume

b) real universal gas constant by ideal universal gas constant

c) real temperature by ideal temperature

d) real volume divided by real pressure

**Answer: ** real volume divided by the ideal volume

**3. Above Boyle temperature real gases show __________ deviation from ideal gases.**

a) positive

b) negative

c) no

d) both positive and negative

**Answer: ** positive

**4. ****Which of the following is a corrected ****equation of ideal gas equation?**

a) (P – an^{2}V^{2})(V – nb) = nRT

b) (P – an^{2}/V^{2})(V + nb) = nRT

c) (P + an^{2}/V^{2})(V – nb) = nRT

d) (P – an^{2}/V^{2})(V – nb) = nRT

**Answer: ** (P – an^{2}/V^{2})(V – nb) = nRT

**5. The value of a in van der Waal equation is _____________ /dependent on ___________**

a) pressure

b) temperature

c) pressure and temperature

d) independent of pressure and temperature

**Answer: ** independent of pressure and temperature

**6. What are the units of “b” in van der Waals equation?**

a) L/mol

b) L mol

c) 1/L mol

d) L

**Answer: ** L/mol

**7. A gas that is of 2 moles occupies a volume of about 500 ml at 300 Kelvin and 50 atmospheric pressure, calculate the compressibility factor of the gas.**

a) 1.863

b) 0.7357

c) 0.5081

d) 1.8754

**Answer: ** 0.5081

**8. The plot PV vs v at constant temperature is a straight line for real gases.**

a) true

b) false

**Answer: ** false

**9. PV/nRT is known as ____________**

a) compressibility factor

b) volume factor

c) pressure factor

d) temperature factor

**Answer: ** compressibility factor

**10. Which of the following conditions do you think a real gas behaves as an ideal gas?**

a) high pressure

b) low pressure

c) intermediate pressure

d) at any pressure

**Answer: ** low pressure