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Online Tests
MDCAT Chemistry Chapter 3 Gases Online Test MCQs With Answers
Question # 1
According to the general gas equation, density of an ideal gas depends upon
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Pressure
Temperature
Molar mass of the gas
All of the above
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Question # 2
Helium atom is two times heavier than a hydrogen molecule. At 298 K, the average kinetic energy of a helium atom is
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same as that of a hydrogen molecule
half that of a hydrogen molecule
two times that of a hydrogen molecule
four times that of hydrogen molecule
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Question # 3
For an ideal gas, number of mole in terms of its pressure P, temperature T and gas constant is
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PT/R
PRT
PV/RT
RT/P
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Question # 4
The mono atomic gases are
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Halogens
Noble gases
6h group elements
Nitrogen and oxygen
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Question # 5
Which type of motion is exhibited by gases?
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Vibrational
Transitional
Rotational
All of them
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Question # 6
One dm3 of H2 and O2: has different masses but no. of particles are
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same
H2 has greater
different
O2 has greater
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Question # 7
At higher temperature isotherm of Boyle's law moves away from both axis, is due to increase in:
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pressure
No. of moles
Volume
All
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Question # 8
The density of neon will be highest at
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STP
0°C, 2 atm
273°C, 1 atm
273°C, 2 atm
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Question # 9
If volume of an ideal gas at 0°C 536cm3, what is volume at 1°C
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373 cm3
646 cm3
Becomes 0cm3
746 cm3
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Question # 10
The root mean square velocity of a gas is doubled when the temperature is
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reduced to half.
reduced to one-fourth
increased four times
inereased two times
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Question # 11
The volume of gas depends upon the------- moleules
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Size of
Space between
Molecular weight
both a and b
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Question # 12
According to kinetic theory of gases kinetic energy depends on
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Temperature
Collision
Pressure
Atomic number
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Question # 13
The pressure exerted by gas molecules is due to their
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collisions
densities
masses
kinetic energy
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Question # 14
If temperature is 73K and volume is 146 cm3 then calculate the value of K=V/T
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5
4
3
2
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Question # 15
At constant volume, for a fixed number of moles of a gas the pressure of the gas increases with size of temperature due to
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increase in average molecular speed
increase in number of moles
increase in molecular attraction
decrease in the distance between the molecules
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Question # 16
The number of molecules in 22.4 dm3 of gas at 0°C and 1 atm are
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6.02×10(23)
6.02× 10(25)
6.02×10(22)
6.02×10(21)
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Question # 17
Density of a gas increases by
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increasing value of R
decreasing value of R
increasing T
decreasing T
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Question # 18
An ideal gas, obeying Kinetic theory of gases cannot be liquified, because
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its critical temperature is above 0°C
its molecules are relatively small in size
It solidifies before becoming a liquid
Forces acting between its molecules are negligible
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Question # 19
Which of the following is the correct equation to calculate relative molecular mass of a gas
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M=mPRTV
M=mPR/VT
M=PV/mRT
M=mRT/PV
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Question # 20
The temperature of a gas is directly proportional to its
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average translational kinetic energy
enthalpy
internal energy
hydration energy
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