Redox Reactions NEET Questions

Physical Chemistry - Redox Reactions and Electrochemistry

Redox Reactions MCQ Questions


13.
Number of electrons transferred in the reaction 4Na + O₂ → 2Na₂O is:
A.
8
B.
2
C.
1
D.
4
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ANSWER :
D. 4
14.
Identify the species being reduced in: 3Fe₃O₄ + 8Al → 9Fe + 4Al₂O₃
A.
Al (aluminium is reduced)
B.
Fe₃O₄ (iron is reduced)
C.
Neither species is reduced
D.
Both Fe and Al
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ANSWER :
B. Fe₃O₄ (iron is reduced)
15.
The oxidation number of S in H₂SO₄ is:
A.
+6
B.
+2
C.
-2
D.
+4
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ANSWER :
A. +6
16.
The oxidation number of Cr in K₂Cr₂O₇ is:
A.
+2
B.
+7
C.
+6
D.
+3
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ANSWER :
C. +6
17.
The oxidation number of Mn in KMnO₄ is:
A.
+6
B.
+2
C.
+7
D.
+4
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ANSWER :
C. +7
18.
The oxidation number of N in HNO₃ is:
A.
+4
B.
+3
C.
-3
D.
+5
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ANSWER :
D. +5