Question map
Not attempted
Correct
Incorrect
★
Bookmarked
Loading…
Q116
(NDA-II/2024)
NA › NA
Official Key
Which one among the following is an example of oxidation reaction ?
Result
Your answer:
—
·
Correct:
C
Explanation
{
"subject_id": "SNT",
"sub_subject_id": "SNT-01",
"explanation": "
An oxidation reaction is a chemical process involving the loss of electrons or the addition of oxygen to a substance. Rusting of iron is a classic example of this process.
When iron is exposed to oxygen and moisture (water) over time, it undergoes a redox reaction to form hydrated iron(III) oxide ($Fe_2O_3 \cdot nH_2O$), commonly known as rust. In this reaction, iron atoms lose electrons (oxidation) to oxygen molecules.
The other options are categorized as physical changes, not chemical reactions:
- Freezing of water and Boiling of petrol are phase transitions (liquid to solid and liquid to gas, respectively) where the chemical identity remains unchanged.
- Dissolving sugar in water is a physical process of solvation where sugar molecules disperse in water without forming new chemical substances.
How others answered
Each bar shows the % of students who chose that option.
Green bar = correct answer, blue outline = your choice.
Community Performance
Out of everyone who attempted this question.
100%
got it right
✓ Thank you! We'll review this.