Chemical Equations · UPSC CDS/OTA · Question 29 of 30

Chemical Equations – Question 29

Step-by-step solution. Chemical Equations for UPSC CDS/OTA.

Topic
Chemical Equations
Subject
General Studies
Difficulty
Medium
Solve Time
45–60 sec

Solved UPSC CDS/OTA Question

A solved UPSC CDS/OTA PYQ — decoded step-by-step.

Solve it the standard way once — then learn the shortcut.

Q · Chemical EquationsMedium · 45s

Rusting can be prevented by: 1. Galvanization 2. Painting 3. Alloying Which is correct?

TopicChemical Equations
Question Typemultiple choice
DifficultyMedium
Marking+1 / −0.33
Test Duration30 min

Step-by-Step Solution

The complete worked solution.

Every step explained — no skipped algebra.

All these prevent iron from reacting with air and moisture.

Final Answer: Option D — 1, 2 and 3
Solve Question✦ Build Plan
Chemical Equations Question 29 – UPSC CDS/OTA