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Online Tests
Chemistry Fsc Part 1 Chapter 3 Online Test MCQs With Answers
Question # 1
An Ideal gas can not be liquefied because.
Choose an answer
Its critical temperature is always above 0
o
C
It molecules are relatively smaller in size
Its solidify before becoming a liquid
Force operative between its molecules are negligible
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Question # 2
Observed pressure is less than ideal pressure for any gas due to
Choose an answer
Intermolecular forces
Size of molecules
Boiling point of molecules
Both a and c
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Question # 3
Noon has low critical temperature and pressure as compared to other gases. the most probable reason is that
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Its octet is complete
It is a monoatomic gas
It has very low polarizability
It has least forces of attraction
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Question # 4
Which of the following will have the same number of molecules at STP
Choose an answer
280 cm
3
of CO
2
and 280 cm
3
of N
2
O
11.2 dm
3
of O
2
and 32 g of O
2
44 g of CO
2
and 11.2 dm
3
of CO
28 g of N
2
and 5.6 dm
3
of oxygen
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Question # 5
Which is not example of natural plasma.
Choose an answer
Lightening bolt
Aurora
Neon sign
Sum
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Question # 6
A gas is heated in such a way that its volume and absolute temperature both are doubled. the pressure of the gas
Choose an answer
Becomes 2 times
Becomes 4 times
Become half
Remain same
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Question # 7
The real gas obeying Van der Waal's equation will resemble ideal gas is.
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both 'a' and 'b' are large
both 'a' and 'b' and small
'a' is small and 'b' is large
'a' is large and 'b' is small
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Question # 8
A real gas obeying Van der Waal's equation will resemble ideal gas if.
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Both a and b are large
Both a and b are small or zero
A is small and b is large
A is large and b is small
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Question # 9
More ideal gas at room temperature is.
Choose an answer
CO2
NH3
SO2
N2
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Question # 10
The deviation of a gas from ideal behaviour is maximum at.
Choose an answer
-10
o
C and 5.0 atm
-10
o
C and 2.0 atm
100
o
C and 2.0 atm
0
o
C and 2.0 atm
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Question # 11
The diffusion of gases at absolute zero will be
Choose an answer
Unchanged
Zero
slightly decreases
Slightly increases
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Question # 12
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.
Choose an answer
1/3
8/9
1/9
16/17
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Question # 13
Which of the following will have highest rate of diffusion
Choose an answer
O2
CO2
NH3
SO2
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Question # 14
If 2 mol of an ideal gas at 546 K occupy a volume of 44.8 dm3, the pressure must be.
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1 atm
2 atm
3 atm
4 atm
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Question # 15
The order of the rate of diffusion of gases NH3, SO3, Cl2 and CO2 is.
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NH3>SO2>CL2>CO2
NH3>CO2>SI2>Cl2
Cl2>SO2>CO2>NH3
Cl2>SO2>CO2>NH3
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Question # 16
Gas molecules show more deviation from ideal behaviour at high pressure because.
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Velocity of molecules increases
Velocity of molecules decreases
Force of attraction between molecules increases
Force of collision per unit area increases
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Question # 17
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.
Choose an answer
0.082 dm3 atm
1.987 cal.
8.313 J
All are correct.
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Question # 18
How should the condition be changed to prevent the volume of a given gas from expanding when its mass is increased
Choose an answer
Temperature is lowered and pressure is increased
Temperature is increase and pressure is lowered
Temperature and pressure both are lowered
Temperature and pressure both are increased
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