Electronic Concepts of Oxidation and Reduction NEET Questions

Physical Chemistry - Redox Reactions and Electrochemistry

Electronic Concepts of Oxidation and Reduction MCQ Questions


7.
Which of the following half-reactions represents oxidation?
A.
Cu²⁺(aq) + 2e⁻ → Cu(s)
B.
Cl₂(g) + 2e⁻ → 2Cl⁻(aq)
C.
Fe³⁺(aq) + e⁻ → Fe²⁺(aq)
D.
Zn(s) → Zn²⁺(aq) + 2e⁻
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ANSWER :
D. Zn(s) → Zn²⁺(aq) + 2e⁻
8.
Which of the following half-reactions represents reduction?
A.
Fe²⁺(aq) → Fe³⁺(aq) + e⁻
B.
2I⁻(aq) → I₂(s) + 2e⁻
C.
Ag⁺(aq) + e⁻ → Ag(s)
D.
Mg(s) → Mg²⁺(aq) + 2e⁻
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ANSWER :
C. Ag⁺(aq) + e⁻ → Ag(s)
9.
In the reaction Zn(s) + Cu²⁺(aq) → Zn²⁺(aq) + Cu(s), the number of electrons transferred is:
A.
1
B.
2
C.
4
D.
3
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ANSWER :
B. 2
10.
Identify the species being oxidised in: 2Al + 3Cl₂ → 2AlCl₃
A.
AlCl₃
B.
Cl₂
C.
Both Al and Cl₂
D.
Al
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ANSWER :
D. Al
11.
In the formation of MgO from Mg and O₂, magnesium is:
A.
Oxidised by losing 2 electrons
B.
Oxidised by gaining 2 electrons
C.
Reduced by losing 2 electrons
D.
Reduced by gaining 2 electrons
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ANSWER :
A. Oxidised by losing 2 electrons
12.
When a species accepts electrons, what happens to its oxidation number?
A.
It remains unchanged
B.
It increases
C.
It decreases
D.
It first increases then decreases
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ANSWER :
C. It decreases