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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
In peroxides, the oxidation no. of O is
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+1
-1
+3
-3
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Question # 2
Formation of water form hydrogen and oxygen is:
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Redox reaction
Acid-base reaction
Neutralization
Decomposition
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Question # 3
Which one of the following is not an electrolytic cell:
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Down cell
Galvanic cell
Nelson' cell
Both a and c
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Question # 4
Br2 + H2S __ 2HBr + S, which one is oxidizing agent:
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H2S
Br2
S
2HBr
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Question # 5
The metallic plates through which electrons enters and leaves electrolytes:
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Wires
Electrodes
Both
Nil
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Question # 6
The most common example of corrosion is:
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Chemical decay
Rusting of iron
Rusting of aluminum
Rusting of tin
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Question # 7
____________ are good conductors of electricity.
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Covalent compound
Metals
Both
None of these
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Question # 8
____________ of copper is done by electrolysis.
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Production
Refining
Both
Nil
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Question # 9
Electrolyte is ____________ solid form.
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in
Sometimes in
Never in
Always in
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Question # 10
Which one is strong electrolyte ?
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NH4OH
NaOH
a & b
Nil
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Question # 11
Gain of electrons in a reaction is called ____________reaction.
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Oxidation
Reduction
Both
Nil
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Question # 12
In the redox reaction between zn and HCI. the oxidizing agent is:
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zn
H
+
C
H
2
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Question # 13
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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