This set of Basic Chemical Engineering Multiple Choice Questions & Answers (MCQs) focuses on “Ideal Gas Law”.
1. Which of the following term does not involve in ideal gas law?
a) Pressure
b) Volume
c) Temperature
d) Time
View answer
Explanation: Ideal gas law is PV = nRT, which does not involve time.
2. What is the shape of a P-T curve for ideal gas?
a) Straight line
b) Parabolic
c) Hyperbolic
d) Ellipse
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Explanation: P-T curve is a straight line for ideal gas.
3. What is the shape of a V-T curve for ideal gas?
a) Straight line
b) Parabolic
c) Hyperbolic
d) Ellipse
View answer
Explanation: V-T curve is straight line for ideal gas.
4. What is the shape of a P-V curve for an ideal gas?
a) Straight line
b) Parabolic
c) Hyperbolic
d) Ellipse
View answer
Explanation: P-V curve is hyperbolic for an ideal gas.
5. Which of the following is not true about ideal gas molecules?
a) They have negligible size
b) They do not have attractive forces
c) They do not apply pressure
d) They move in random motion
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Explanation: Ideal gas molecules apply pressure to the walls of a container.
6. What is the pressure of a 5 liter/mole ideal gas at temperature 27oC?
a) 2.5 atm
b) 3.8 atm
c) 4.4 atm
d) 5.3 atm
View answer
Explanation: PV = nRT, => P*5 = 0.0821*300, => P = 5.3 atm.
7. What is the Temperature of a 2 liter/mole ideal gas with pressure 10 atm?
a) 243.6 K
b) 268.4 K
c) 289.1 K
d) 313.5 K
View answer
Explanation: PV = nRT, => 10*2 = 0.0821*T, => T = 243.6 K.
8. First of the two ideal gases has twice molar volume as much as the second at same temperature, what is the ratio of their pressures?
a) 4:1
b) 1:4
c) 2:1
d) 1:2
View answer
Explanation: P1V1 = n1RT1, P2V2 = n2RT2 dividing both the equations, => P1:P2 = 1:2.
9. 88 grams of CO2 at 27oC is applying 5 atm pressure, what is the volume occupied by it?
a) 5.6 liter
b) 7.9 liter
c) 9.8 liter
d) 12.2 liter
View answer
Explanation: n = 88/44 = 2, PV = nRT, => 5*V = 2*0.0821*300, => V = 9.8 liter.
10. What is the density of O2 at 27oC with pressure 1 atm?
a) 1.1 g/L
b) 1.3 g/L
c) 1.5 g/L
d) 1.7 g/L
View answer
Explanation: Molecular wt. of O2= 44 g, PV = nRT, => PV = (m/M)RT, => d = PM/RT = (1*32)/(0.0821*300) = 1.3 g/L.
11. What is the molecular mass of an ideal gas with pressure 1 atm, and density 10 g/L at temperature 27oC?
a) 84.5 g
b) 135.1 g
c) 186.8 g
d) 246.3 g
View answer
Explanation: M = dRT/P = 10*0.0821*300/1 = 246.3 g.
12. What is the specific gravity of CO2 at 27oC and pressure 1 atm with respect to air of with density 1 g/L?
a) 1.23
b) 1.55
c) 1.78
d) 1.96
View answer
Explanation: Density of CO2 = PM/RT = 1*44/(0.0821*300) = 1.78 g/L, => Specific gravity = 1.78/1 = 1.78.
13. What is the specific gravity of CO at 27oC and pressure 5 atm with respect to air (molecular wt. = 29 g) at 27oC and pressure 10 atm?
a) 0.48
b) 0.56
c) 0.64
d) 0.72
View answer
Explanation: Density of CO = 5*28/(0.0821*300) = 5.68 g/L, density of air = 10*29/(0.0821*300) = 11.77 g/L, => specific gravity = 5.68/11.77 = 0.48.
14. What is the compressibility factor for an ideal gas?
a) 1
b) 2
c) 3
d) Depends on the gas
View answer
Explanation: Compressibility of an ideal gas is always 1.
15. Which of the following is not the unit of R?
a) Atm.liter/K.mole
b) Pa.m3/K
c) N.Kg.m3/K.mole
d) None of the mentioned
View answer
Explanation: N.Kg.m/K.mole is the unit of R.
Sanfoundry Global Education & Learning Series – Basic Chemical Engineering.
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