Balancing of Redox Reactions NEET Questions

Physical Chemistry - Redox Reactions and Electrochemistry

Balancing of Redox Reactions MCQ Questions


1.
The two methods commonly used to balance redox equations are:
A.
Algebraic method and graphical method
B.
Oxidation number method and ion-electron (half-reaction) method
C.
Atomic balance method and charge method
D.
Trial and error method only
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ANSWER :
B. Oxidation number method and ion-electron (half-reaction) method
2.
The ion-electron method is also known as:
A.
Algebraic method
B.
Half-reaction method
C.
Hit and trial method
D.
Oxidation number method
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ANSWER :
B. Half-reaction method
3.
In the oxidation number method, the first step is to:
A.
Balance hydrogen and oxygen first
B.
Add electrons to balance charges
C.
Calculate molecular weights
D.
Write the correct formulas of all reactants and products
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ANSWER :
D. Write the correct formulas of all reactants and products
4.
In the balanced equation Cr₂O₇²⁻ + 3SO₃²⁻ + 8H⁺ → 2Cr³⁺ + 3SO₄²⁻ + 4H₂O, the total number of electrons transferred per Cr₂O₇²⁻ is:
A.
3
B.
2
C.
8
D.
6
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ANSWER :
D. 6
5.
When K₂Cr₂O₇ reacts with FeSO₄ in acidic medium, balanced equation is K₂Cr₂O₇ + 6FeSO₄ + 7H₂SO₄ → ____ + 3Fe₂(SO₄)₃ + K₂SO₄ + 7H₂O. Fill in the blank:
A.
Cr(SO₄)
B.
CrSO₄
C.
Cr₃SO₄
D.
Cr₂(SO₄)₃
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ANSWER :
D. Cr₂(SO₄)₃
6.
Balance: KMnO₄ + FeSO₄ + H₂SO₄ → ?. Coefficient of FeSO₄ is:
A.
5
B.
2
C.
10
D.
8
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ANSWER :
C. 10