Balancing of Redox Reactions NEET Questions

Physical Chemistry - Redox Reactions and Electrochemistry

Balancing of Redox Reactions MCQ Questions


13.
In the half-reaction Cr₂O₇²⁻ + 14H⁺ + 6e⁻ → 2Cr³⁺ + 7H₂O, what is the medium?
A.
Neutral
B.
Acidic
C.
Basic
D.
Strongly basic
😑 View Answer Rough Work Error
ANSWER :
B. Acidic
14.
Balanced half-reaction for MnO₄⁻ → Mn²⁺ in acidic medium is:
A.
MnO₄⁻ + 8H⁺ + 5e⁻ → Mn²⁺ + 4H₂O
B.
MnO₄⁻ + 8H⁺ + 3e⁻ → Mn²⁺ + 4H₂O
C.
MnO₄⁻ + 4OH⁻ + 5e⁻ → Mn²⁺ + 2H₂O
D.
MnO₄⁻ + 4H⁺ + 5e⁻ → Mn²⁺ + 2H₂O
😑 View Answer Rough Work Error
ANSWER :
A. MnO₄⁻ + 8H⁺ + 5e⁻ → Mn²⁺ + 4H₂O
15.
Balanced half-reaction for MnO₄⁻ → MnO₂ in basic medium is:
A.
MnO₄⁻ + 2H₂O + 5e⁻ → MnO₂ + 4OH⁻
B.
MnO₄⁻ + 8H⁺ + 5e⁻ → MnO₂ + 4H₂O
C.
MnO₄⁻ + 2H₂O + 3e⁻ → MnO₂ + 4OH⁻
D.
MnO₄⁻ + 4H⁺ + 3e⁻ → MnO₂ + 2H₂O
😑 View Answer Rough Work Error
ANSWER :
C. MnO₄⁻ + 2H₂O + 3e⁻ → MnO₂ + 4OH⁻
16.
Balanced half-reaction for Cr₂O₇²⁻ → Cr³⁺ in acidic medium is:
A.
Cr₂O₇²⁻ + 14H⁺ + 3e⁻ → 2Cr³⁺ + 7H₂O
B.
Cr₂O₇²⁻ + 14H⁺ + 6e⁻ → 2Cr³⁺ + 7H₂O
C.
Cr₂O₇²⁻ + 14OH⁻ + 6e⁻ → 2Cr³⁺ + 7H₂O
D.
Cr₂O₇²⁻ + 7H⁺ + 6e⁻ → 2Cr³⁺ + 7H₂O
😑 View Answer Rough Work Error
ANSWER :
B. Cr₂O₇²⁻ + 14H⁺ + 6e⁻ → 2Cr³⁺ + 7H₂O
17.
How many electrons are transferred in: 5e⁻ + 8H⁺ + MnO₄⁻ → Mn²⁺ + 4H₂O?
A.
1
B.
5
C.
8
D.
3
😑 View Answer Rough Work Error
ANSWER :
B. 5
18.
The number of electrons in the half-reaction Fe²⁺ → Fe³⁺ + e⁻ is:
A.
1
B.
3
C.
2
D.
0
😑 View Answer Rough Work Error
ANSWER :
A. 1