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Online Tests
Chemistry Fsc Part 1 Chapter 3 Online Test MCQs With Answers
Question # 1
The Van der Waals' equation explain the behaviour of.
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Ideal gas
Real gas
Vapours
Non ideal gases
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Question # 2
For a gas obeying Boyle's law if pressure is doubled, the volume becomes.
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Double
One half
Four times
Remains constant
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Question # 3
Rate of diffusion of CO and N
2
are same at room temperature due to the reason, that
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Both are diatomic molecules
Both have same multiple bond in them
Both have lone pairs in them
Both have same molar masses
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Question # 4
What are the SI of excluded volume 'b' in Vander waal equation.
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dm
3
mol -1
m3 mol -1
mol dm-3
mol m-3
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Question # 5
Equal masses of methane and oxygen are mixed in an empty container at 25
o
C. The fraction of total pressure exerted by oxygen is.
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1/3
8/9
1/9
16/17
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Question # 6
The temperature of natural plasma is about.
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200000
o
C
10000
o
C
5000
o
C
1000
o
C
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Question # 7
The rate of diffusion of a gas is
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Directly proportional to its density
Directly proportional to molecular mass
Inversely proportional to its density
Inversely proportional to square root of its molecular mass
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Question # 8
Gases of air, always remains in the random motion and do not settle due to.
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Elastic collision of gas molecules
Unequal number of different gas molecules
Difference impartial pressure of gas molecules
Difference in molecular masses of air gases
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Question # 9
If absolute temperature of gas is doubled and the pressure is reduced to one half, the volume of the gas will.
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Remain unchanged
Increase four times
Reduce to 1/4
Be doubled
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Question # 10
Which one of the following expressions is for ideal gas equation.
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PM= nRT
PV = nRT
PV = dRT
PV= nTP
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Question # 11
If temperature of one mole of ideal gas at 273 K and one atmospheric pressure is increased by 1 K, amount of energy absorbed is.
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0.082 dm3 atm
1.987 cal.
8.313 J
All are correct.
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Question # 12
The volume of a gas at 0 oC is 273 dm3, the pressure remaining constant. At which temperature its volume will be doubled.
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273 K
273
o
C
546
o
C
316 K
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Question # 13
Under which conditions of temperature and pressure will a real gas behave most like an ideal gas.
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Low temperature and how pressure
High temperature and high pressure
Low temperature and high pressure
High temperature and low pressure
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Question # 14
In gas occupies a volume of 2 dm
3
at 27°C and I atm pressure. The expression for its volume at S.T.P. is
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Question # 15
Which is not example of natural plasma.
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Lightening bolt
Aurora
Neon sign
Sum
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Question # 16
Keeping the temperature constant of the gas is expanded.
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Pressure will decrease
Temperature will increase
Kinetic energy of molecules will increase
No. of gas molecules increases
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Question # 17
What are the SI units of Van der Waal constant 'a'
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atm dm3 mol-2
atm dm6 mol-2
Nm4 mol-2
Nm mol-1
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Question # 18
Observed pressure is less than ideal pressure for any gas due to
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Intermolecular forces
Size of molecules
Boiling point of molecules
Both a and c
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