Oxidation Number, Rules for Assigning Oxidation Number NEET Questions

Physical Chemistry - Redox Reactions and Electrochemistry

Oxidation Number, Rules for Assigning Oxidation Number MCQ Questions


7.
In their compounds, all alkali metals exhibit oxidation number:
A.
-1
B.
Variable
C.
+2
D.
+1
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ANSWER :
D. +1
8.
Alkaline earth metals (Mg, Ca, Sr, Ba) exhibit oxidation number:
A.
Always -2
B.
Variable (+1, +2, +3)
C.
+1 in all compounds
D.
+2 in all their compounds
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ANSWER :
D. +2 in all their compounds
9.
Aluminium is regarded to have an oxidation number of:
A.
+1 in all compounds
B.
+2 in all compounds
C.
+3 in all its compounds
D.
Variable
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ANSWER :
C. +3 in all its compounds
10.
The oxidation number of oxygen in MOST compounds is:
A.
+2
B.
0
C.
-2
D.
-1
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ANSWER :
C. -2
11.
In peroxides (e.g., H₂O₂, Na₂O₂), each oxygen atom is assigned oxidation number:
A.
-2
B.
+1
C.
-1
D.
0
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ANSWER :
C. -1
12.
In superoxides (e.g., KO₂, RbO₂), each oxygen is assigned oxidation number:
A.
-½
B.
-2
C.
0
D.
-1
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ANSWER :
A. -½