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Online Tests
Chemistry Fsc Part 1 Online Test MCQs With Answers
Question # 1
Ice float over water because.
Choose an answer
Its structure is diamond like
Its density is maximum at 4
o
C
It is less dense than water
It has no regular arrangement of molecules.
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Question # 2
The molecule of CO2 in dry ice form the.
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Ionic crystals
Covalent crystals
Molecular crystals
Any type of crystals
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Question # 3
What has a mass equal to that of one mole of water.
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22.4 dm3 of water
One mole of steam
One molecule of water
Two moles of hydrogen molecules and one mole of oxygen molecules.
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Question # 4
Which of the following molecule obey octet rule.
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BF3
BCl3
NH2
SF6
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Question # 5
Which one of the following salts dissolved in water to form a solution with a pH greater than 7
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NaCl
CuSO4
Na2CO3
NH4Cl
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Question # 6
The mass of one mole of electrons is.
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1.008 mg
0.55 mg
0.184 mg
1.673 mg
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Question # 7
The number of moles of acid or base required by one dm
3
of buffer to alter its pH by one unit is called
Choose an answer
Buffer efficiency
Buffer capacity
Buffer action
None
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Question # 8
Node is a surface on which probability of finding electron is
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Zero
More than 95%
50%
Infinite
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Question # 9
In discharge tube, properties of X-rays depend upon the nature of.
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Residual gas
Cathode plate
Anode plate
All of these
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Question # 10
X- rays have same nature as
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Alpha rays
Beta rays
Gamma rays
Cathods rays
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Question # 11
As compared to pure atomic orbitals the hybrid orbitals have.
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Low energy
High energy
Same energy
None of these
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Question # 12
When a chemical reaction is completed.
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Instantaneous rate > average rate
Instantaneous rate = average rate
Instantaneous rate is zero
Both average and instantaneous rates become zero
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Question # 13
Molecule in which the distance between two carbon atoms in the largest is.
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C2H6
C2H4
C2H2
C6H6
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Question # 14
In paper chromatograghy the point at which the solvent rises to maximum extent is called
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Event
Chromatogram
Solvent front
Base line
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Question # 15
In which one of the following pairs do the molecule have similar shape.
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BF3 and AlCl3
CO2 and H2O
CH4 and PH3
NH3 and BCl3
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Question # 16
The rate of diffusion of a gas of molar mass 72 as compared to H2 will be.
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1/6 times
1.4 times
6 times
same
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Question # 17
Unit of rate constant is the same as that of the rate of reaction in
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Zero order reaction
1st order reaction
2nd order reaction
3rd order reaction
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Question # 18
A buffer solution can be prepared by mixing
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Weak acid and its salt with weak base
Weak base and its salt with strong acid
Strong acid and its salts with weak base
Strong base and its salt with weak acid
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