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Online Tests
Chemistry 9th Class English Medium Unit 7 Online Test MCQs With Answers
Question # 1
Which one is strong electrolyte ?
Choose an answer
NH4OH
NaOH
a & b
Nil
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Question # 2
Spontaneous chemical reactions take place in:
Choose an answer
electrolytic cell
Galvanic cell
Nelson' s cell
downs cell
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Question # 3
The formula of rust is:
Choose an answer
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 # 4
In metal hydrides, the oxidation number of hydrogen is
Choose an answer
+1
-1
+2
-2
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Question # 5
Copper extracted from its ore is ____________ % pure.
Choose an answer
98%
99%
96%
Nil
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Question # 6
Formation of water form hydrogen and oxygen is:
Choose an answer
Redox reaction
Acid-base reaction
Neutralization
Decomposition
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Question # 7
The branch of chemistry which deals with inter conversion of electrical & chemical energy is:
Choose an answer
Biochemistry
Electrochemistry
Organic chemistry
None of these
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Question # 8
____________ of copper is done by electrolysis.
Choose an answer
Production
Refining
Both
Nil
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Question # 9
Metals are covered by using.
Choose an answer
Baeyer's test
Bohr's
Electrolysis
None
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Question # 10
In silver plating Anode is made of:
Choose an answer
Gold
Ag
Neon
Nil
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Question # 11
Which one of the following is a galvanic cell?
Choose an answer
Daniel cell
Nelson's cell
Down's cell
Both B and C
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Question # 12
____________ is prevented by Metallic coating.
Choose an answer
NaCl
Rust
All
None of these
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Question # 13
Which is used for industrial manufacture of NaCI?
Choose an answer
Daniel cell
Down's cell
Nelson's cell
None of these
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