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Online Tests
Chemistry Fsc Part 1 Chapter 3 Online Test MCQs With Answers
Question # 1
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 # 2
Which one of the following gases cannot be liquefied by Line's method.
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Water vapours
NH3
Nitrogen
H2
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Question # 3
Total pressure of mixture of two gases is.
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The sum of their partial pressures.
The difference of their partial pressures
The product of their practical pressures
The ratio of their partial pressures
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Question # 4
Which is not example of natural plasma.
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Lightening bolt
Aurora
Neon sign
Sum
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Question # 5
Borax has the chemical formula.
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KNO3
Na2B3O7.10H2O
Na2CO3
NaNO3
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Question # 6
If the number of gas molecules are doubled in a certain volume of a gas, the pressure is.
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Decreased to half
Doubled
Increased to four time
Remains unchanged
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Question # 7
Which of the following will have the same number of molecule at STP.
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280 cm3 CO2 and 280 cm3 of N2O
11.2 dm3 of O2 and 32 g of O2
44 g of CO2 and 11.2 dm3 of CO
28 g of N2 and 5.6 dm3 of oxygen
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Question # 8
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 # 9
Density of a gas is usually expressed in
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kg m-3
kg dm-3
g dm-3
g cm-3
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Question # 10
Weak intermolecular forces are present in.
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Only gases
Only liquid
Only solids
gases, liquids and solids
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Question # 11
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 # 12
Equal masses of methane and oxygen are mixed in an empty container at 25°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 # 13
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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Question # 14
The molar volume of CO2 is maximum at.
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STP
127
o
C and 1 atm
0
o
C and 2 atm
273
o
C and 2 atm
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Question # 15
The deviation of a gas from ideal behaviour is maximum at.
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-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 # 16
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 # 17
Normal temperature and pressure (S.T.P) of gas rafers to
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273 K and 76 mm Hg
273° C and 760 mm Hg
273 K and 760 mm Hg
273° C and 76 mm Hg
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Question # 18
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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