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9th Class Chemistry Chapter 9 Table of Elements and Their Symbols English Medium KPK Boards Online Mcqs MCQs With Answers
Question # 1
Reduction means
Choose an answer
Removal of H2
Removal of electrons
Gain of electrons
Gain of O2
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Question # 2
The most common example of corrosion is:
Choose an answer
Chemical decay
Rusting of iron
Rusting of aluminum
Rusting of tin
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Question # 3
Films are coated by special chemical known as ____________ detectors.
Choose an answer
Photographic
Image
Nil
Both
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Question # 4
The formula of rust is:
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Fe
2
O
3
,nH
2
o
Fe
2
O
3
Fe(OH)
3
-nH
2
O
Fe(OH)
3
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Question # 5
In peroxides, the oxidation no. of O is
Choose an answer
+1
-1
+3
-3
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Question # 6
Copper extracted from its ore is ____________ % pure.
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98%
99%
96%
Nil
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Question # 7
CO2 the oxidation number of C =.
Choose an answer
+1
+2
+3
+4
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Question # 8
NaOH is prepared by ____________ of NaCL (aqueous).
Choose an answer
Electrolysis
Decomposition
A & B
Nil
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Question # 9
____________ is prevented by Metallic coating.
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NaCl
Rust
All
None of these
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Question # 10
The branch of chemistry which deals with inter conversion of electrical & chemical energy is:
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Biochemistry
Electrochemistry
Organic chemistry
None of these
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Question # 11
The oxidation number of chromium in K
2
Cr
2
O
7
is:
Choose an answer
+2
+6
+7
+14
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