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Online Tests
Chemistry 9th Class English Medium Unit 7 Online Test MCQs With Answers
Question # 1
The oxidation number of chromium in K
2
Cr
2
O
7
is:
Choose an answer
+2
+6
+7
+14
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Question # 2
CO2 the oxidation number of C =.
Choose an answer
+1
+2
+3
+4
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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
During the formation of water from hydrogen and oxygen, which of the following does not occur?
Choose an answer
Hydrogen has oxidized
oxygen has reduced
oxygen gains electrons
hydrogen behaves as oxidizing agent
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Question # 5
By electrolytic refining of copper , it is ____________ % pure.
Choose an answer
98
99
99.99
100
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Question # 6
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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Question # 7
In metal hydrides, the oxidation number of hydrogen is
Choose an answer
+1
-1
+2
-2
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Question # 8
Copper extracted from its ore is ____________ % pure.
Choose an answer
98%
99%
96%
Nil
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Question # 9
____________ is an irreversible cell.
Choose an answer
Dry cell
Chargeable cell
Zn cell
None of these
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Question # 10
Oxidation means
Choose an answer
Gain of oxygen
Removal of oxygen
Gain of hydrogen
Gain of electrons
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Question # 11
Which one is strong electrolyte ?
Choose an answer
NH4OH
NaOH
a & b
Nil
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