Hydrogen peroxide acts as an oxidizing agent in which reaction? MCQ with Answer and Explanation

Hydrogen peroxide acts as an oxidizing agent in which reaction?
A. H₂O₂ + PbS → PbSO₄ + H₂O
B. H₂O₂ + 2KI + H₂SO₄ → I₂ + K₂SO₄ + 2H₂O
C. H₂O₂ + O₃ → H₂O + 2O₂
D. H₂O₂ + Ag₂O → 2Ag + H₂O + O₂
Answer: Option A
Solution (By JKExamLibrary)
In reaction C, H₂O₂ oxidizes PbS (black) to PbSO₄ (white), where oxygen atoms from H₂O₂ are added. H₂O₂ itself is reduced to H₂O. In reaction D, H₂O₂ oxidizes I⁻ to I₂; that is also oxidation. But the most straightforward oxidizing reaction among these is the restoration of old paintings (PbS → PbSO₄). Reaction A: H₂O₂ reduces O₃ (acts as reducing agent). Reaction B: H₂O₂ reduces Ag₂O. H₂O₂ can act as both oxidizing and reducing agent.

Discuss this Question (0)

No comments yet. Be the first to start the discussion!

Practice More chemistry Questions

Question #1
Which gas diffuses slowest?
A. CO₂
B. H₂
C. NH₃
D. CH₄

Correct Answer: Option A


Explanation:
Rate ∝ 1/√M. Molar masses: H₂=2, CH₄=16, NH₃=17, CO₂=44. CO₂ has highest mass, diffuses slowest.

This question belongs to: Science chemistry
Question #2
The horizontal rows in the modern periodic table are called:
A. Blocks
B. Periods
C. Groups
D. Families

Correct Answer: Option B


Explanation:
The periodic table has 7 horizontal rows called periods. Elements in the same period have the same number of electron shells. Properties change gradually across a period. Groups are vertical columns (18), where elements have similar valence electron configurations and thus similar chemical properties. Families are informal group names (e.g., halogens). Blocks (s, p, d, f) are based on the orbital in which the last electron enters.

This question belongs to: Science chemistry
Question #3
Which type of plastic is used for electrical switches and handles due to heat resistance?
A. PVC
B. Polythene
C. Bakelite
D. Polystyrene

Correct Answer: Option C


Explanation:
Bakelite is a thermosetting phenol-formaldehyde resin with excellent heat resistance and electrical insulation properties, making it suitable for switches, handles, and electrical fittings. Polythene and PVC are thermoplastics that soften on heating. Polystyrene is brittle and not highly heat resistant. Thermosets do not melt upon reheating.

This question belongs to: Science chemistry