Free MCQs & Online Quiz Practice for Exams

Q: If the absolute temperature of the gas is doubled and pressure is increased 4 times, then the volume becomes: (ETEA 2015)

A) Half

B) Doubled

C) 4 times

D) Unchanged

Q: Choose the correct order of the rate of diffusion of the given four gases: (ETEA 2015)

A) CO > NO₂ > SO₂ > Cl₂

B) CO > SO₂ > NO₂ > Cl₂

C) CO > NO₂ > SO₂ > Cl₂

D) SO₂ > Cl₂ > CO > NO₂

Q: Equal volume of CO and N₂ are taken in identical conditions, the correct relation between masses of two gases is: (ETEA 2015)

A) CO < N₂

B) CO > N₂

C) CO = N₂

D) N₂ < CO

Q: 800 cm³ of a gas at 400 torr pressure and 60 °C was heated until the volume of gas became 3000 cm³. The final temperature of the gas will be: (ETEA 2015)

A) 832.5 K

B) 559.5 K

C) -1105.2 K

D) 726.5 K

Q: A gaseous mixture contains 96% NH₃, 22.6% N₂ and 67.8% H₂ gases. If the total pressure is 50 atm, then the partial pressure of H₂ is: (ETEA 2015)

A) 67.8×100/50

B) 50×100/67.8

C) 67.8×50/100

D) 67.8+50

Q: The critical temperature (T_c) of oxygen is: (ETEA 2016)

A) -147.5 °C

B) -783.0 °C

C) -239.9 °C

D) -118.8 °C

Q: Helium shows negative Thomson effect due to its: (ETEA 2016)

A) Low viscosity

B) Inert nature

C) Resistance to polarize

D) Low density

Q: A gas diffuses √2 times as fast as hydrogen gas; its molecular mass is: (ETEA 2016)

A) 32 amu

B) 25 amu

C) 8 amu

D) 16 amu

Q: A flask contains 6 g of hydrogen gas and 64 g oxygen at RTP. The partial pressure of hydrogen gas in the flask of the total pressure (P) will be: (ETEA 2016)

A) 2/3 P

B) 2/5 P

C) 3/5 P

D) 1/3 P

Q: What is the relative rates of diffusion of equal volume (500 cm³) of hydrogen and oxygen under same conditions of temperature and pressure? (ETEA 2017)

A) 4:1

B) 8:1

C) 16:7

D) 2:1

Q: A container has a mixture of gases: 20% ammonia, 30% hydrogen and 50% oxygen under 50 atm pressure. Choose the correct partial pressures respectively: (ETEA 2017)

A) 10 atm, 25 atm, 15 atm

B) 10 atm, 15 atm, 25 atm

C) 25 atm, 15 atm, 15 atm

D) 15 atm, 25 atm, 10 atm

Q: The charge on the electron and proton is reduced to half the present value. If the present value of Rydberg constant is R, then the new value will be: (ETEA 2018)

A) R²

B) R⁴

C) R⁸

D) R/16

Q: Atmospheric pressure is measured by: (ETEA 2018)

A) Hygrometer

B) Barometer

C) Pyrometer

D) Spherometer

Q: The collision of the gas molecules with the wall of the container is responsible for gaseous pressure. According to van der Waals (after pressure correction) which gas will exert more pressure if temperature is kept constant? (ETEA 2018)

A) Real gas

B) Ideal gas

C) Non-ideal gas

D) All will exert the same pressure

Q: The equation used to describe the behavior of ideal gases under standard conditions is: (ETEA 2018)

A) PV = nRT

B) PM = GRT

C) PuMf = TRT

D) All of the above

Q: When electric current is passed through neon gas it produces: (ETEA 2018)

A) Plasma

B) ?

C) Plasma induced light

D) ?

Q: (Garbled question about molecular mass) — choose the correct molecular mass: (ETEA 2018)

A) 50

B) 15

C) ?

D) ?

Q: A gas has molar mass (question garbled) — choose the correct option: (ETEA 2019)

A) 50 amu

B) 25 amu

C) 16 amu

D) ?

Q: The incorrect statement regarding gas having high value of coefficient of attraction is: (ETEA 2019)

A) Easy to be liquefied

B) Having higher critical temperature

C) Less soluble in water

D) None of the above

Q: Pentane C₅H₁₂ at room temperature does not obey: (ETEA 2019)

A) Charles's law

B) Boyle's law

C) Avogadro's law

D) All of the above