Q. What is the product of the reduction of permanganate ion (MnO4-) in acidic medium? (2019)
-
A.
MnO2
-
B.
Mn2O3
-
C.
Mn2+
-
D.
MnO4
Solution
In acidic medium, the permanganate ion (MnO4-) is reduced to manganese ion (Mn2+).
Correct Answer: C — Mn2+
Learn More →
Q. What is the role of an oxidizing agent in a redox reaction? (2020)
-
A.
It gains electrons
-
B.
It loses electrons
-
C.
It remains unchanged
-
D.
It increases the temperature
Solution
An oxidizing agent gains electrons during a redox reaction, causing another species to be oxidized.
Correct Answer: A — It gains electrons
Learn More →
Q. What is the role of MnO4⁻ in acidic medium during redox reactions? (2020)
-
A.
Oxidizing agent
-
B.
Reducing agent
-
C.
Neutral agent
-
D.
Catalyst
Solution
MnO4⁻ acts as an oxidizing agent in acidic medium, as it gains electrons and is reduced.
Correct Answer: A — Oxidizing agent
Learn More →
Q. What is the standard reduction potential of a half-reaction? (2022)
-
A.
The tendency to gain electrons
-
B.
The tendency to lose electrons
-
C.
The energy released during oxidation
-
D.
The energy absorbed during reduction
Solution
The standard reduction potential indicates the tendency of a species to gain electrons, thus being reduced.
Correct Answer: A — The tendency to gain electrons
Learn More →
Q. What is the standard reduction potential of the half-reaction Cu2+ + 2e- → Cu? (2022)
-
A.
+0.34 V
-
B.
+0.76 V
-
C.
-0.34 V
-
D.
-0.76 V
Solution
The standard reduction potential for the half-reaction Cu2+ + 2e- → Cu is +0.76 V, indicating a strong tendency to gain electrons.
Correct Answer: B — +0.76 V
Learn More →
Q. What is the standard reduction potential of the half-reaction Fe^3+ + 3e- → Fe? (2022)
-
A.
+0.77 V
-
B.
+0.44 V
-
C.
-0.77 V
-
D.
-0.44 V
Solution
The standard reduction potential for the half-reaction Fe^3+ + 3e- → Fe is +0.77 V, indicating a strong tendency to gain electrons.
Correct Answer: A — +0.77 V
Learn More →
Q. Which of the following is an example of an oxidation reaction? (2020)
-
A.
2H2 + O2 → 2H2O
-
B.
C + O2 → CO2
-
C.
Fe + CuSO4 → FeSO4 + Cu
-
D.
Na + Cl2 → NaCl
Solution
In the reaction C + O2 → CO2, carbon is oxidized as it loses electrons to form CO2.
Correct Answer: B — C + O2 → CO2
Learn More →
Q. Which of the following is the oxidizing agent in the reaction: 2MnO4⁻ + 5C2O4²⁻ + 6H⁺ → 2Mn²⁺ + 10CO2 + 3H2O? (2022)
-
A.
MnO4⁻
-
B.
C2O4²⁻
-
C.
H⁺
-
D.
CO2
Solution
In this reaction, MnO4⁻ is reduced to Mn²⁺, thus it acts as the oxidizing agent.
Correct Answer: A — MnO4⁻
Learn More →
Q. Which of the following reactions is an example of a disproportionation reaction? (2023)
-
A.
2H2O2 → 2H2O + O2
-
B.
2Na + Cl2 → 2NaCl
-
C.
Zn + CuSO4 → ZnSO4 + Cu
-
D.
Fe + 2HCl → FeCl2 + H2
Solution
In the reaction 2H2O2 → 2H2O + O2, the oxidation state of oxygen changes from -1 in H2O2 to 0 in O2, indicating that it is both oxidized and reduced.
Correct Answer: A — 2H2O2 → 2H2O + O2
Learn More →
Q. Which of the following reactions is an example of a redox reaction? (2023)
-
A.
H2 + Cl2 → 2HCl
-
B.
NaOH + HCl → NaCl + H2O
-
C.
CaCO3 → CaO + CO2
-
D.
C + O2 → CO2
Solution
The reaction C + O2 → CO2 is a redox reaction because carbon is oxidized and oxygen is reduced.
Correct Answer: D — C + O2 → CO2
Learn More →
Q. Which of the following species can act as an oxidizing agent? (2023)
-
A.
Na+
-
B.
Cl-
-
C.
H2O
-
D.
MnO4-
Solution
MnO4- is a strong oxidizing agent because it can gain electrons and be reduced to Mn2+.
Correct Answer: D — MnO4-
Learn More →
Q. Which of the following species is the strongest oxidizing agent? (2023)
-
A.
F2
-
B.
Cl2
-
C.
Br2
-
D.
I2
Solution
F2 is the strongest oxidizing agent among the halogens due to its high electronegativity and ability to gain electrons.
Correct Answer: A — F2
Learn More →
Showing 31 to 42 of 42 (2 Pages)
