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9th Class Chemistry English Medium KPK Boards Online Mcqs MCQs With Answers
Question # 1
Reduction means
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Removal of H2
Removal of electrons
Gain of electrons
Gain of O2
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Question # 2
Atoms are made of sub _________
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Atoms
Molecules
Charge
Atomic particles
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Question # 3
Oxidation means
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Gain of oxygen
Removal of oxygen
Gain of hydrogen
Gain of electrons
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Question # 4
Bucky balls are ____________ allotropic forms of carbon.
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1st
2nd
3rd
4th
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Question # 5
Amadeo Avogadro was a _______________ scientist.
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Italian
English
Greek
Russian
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Question # 6
1 torr = ?
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1 mm of Hg
1 atm
760 mm of Hg
1 pascal
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Question # 7
Sodium has ________________ no. of protons.
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11
12
13
14
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Question # 8
Atoms form chemical bonds to attain the electronic configuration of
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Halogens
Noble gases
Alkali metals
Alkaline earthmetals
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Question # 9
In period, ionization energy of elements
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Increases
Decreases
Remains constant
None of these
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Question # 10
Oxygen is ___________
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Metals
Non-metals
Gas
b & c
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Question # 11
The oxidation number of chromium in K
2
Cr
2
O
7
is:
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+2
+6
+7
+14
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Question # 12
The concept of orbit was used by:
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J.J Thomson
Rutherford
Bohr
Planck
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Question # 13
The repetition of a property after a certain interval is:
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Periodicity
Properties
Periodicity of properties
None
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