Electronic Concepts of Oxidation and Reduction NEET Questions

Physical Chemistry - Redox Reactions and Electrochemistry

Electronic Concepts of Oxidation and Reduction MCQ Questions


13.
The species that undergoes loss of electrons in a redox reaction:
A.
Has a decrease in oxidation number
B.
Acts as an oxidising agent
C.
Acts as a reducing agent
D.
Is reduced in the process
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ANSWER :
C. Acts as a reducing agent
14.
Consider: 2Na(s) + H₂(g) → 2NaH(s). The two half-reactions are:
A.
2Na⁺ + 2e⁻ → 2Na and 2H⁻ → H₂ + 2e⁻
B.
2Na + 2e⁻ → 2Na⁻ and H₂ → 2H⁺ + 2e⁻
C.
2Na → 2Na⁻ + 2e⁻ and H₂ + 2e⁻ → 2H⁺
D.
2Na → 2Na⁺ + 2e⁻ and H₂ + 2e⁻ → 2H⁻
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ANSWER :
D. 2Na → 2Na⁺ + 2e⁻ and H₂ + 2e⁻ → 2H⁻
15.
In the reaction 2Na(s) + H₂(g) → 2NaH(s), hydrogen acts as:
A.
Catalyst
B.
Oxidising agent
C.
Reducing agent
D.
Both oxidising and reducing agent
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ANSWER :
B. Oxidising agent
16.
Which of the following is the strongest reducing agent based on standard electrode potential?
A.
Na
B.
Cs
C.
K
D.
Li
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ANSWER :
D. Li
17.
Which of the following is the strongest oxidising agent?
A.
Br₂
B.
F₂
C.
I₂
D.
Cl₂
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ANSWER :
B. F₂
18.
In the displacement reaction Zn + CuSO₄ → ZnSO₄ + Cu, electrons are transferred from:
A.
Cu²⁺ to Zn
B.
Zn to SO₄²⁻
C.
Zn to Cu²⁺
D.
SO₄²⁻ to Zn
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ANSWER :
C. Zn to Cu²⁺