Rusting and corrosion

This type of question, asked 4 times: 2023, 2024, 2025, 2026. All 6 questions below, oldest first.

Try each one first, then open its answer.

Question 1
2023
10 $Which of the following metals do not corrode in moist air ?$
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Question 2
2024
28 (b) $State giving reason for the change in appearance observed when each of the following metal is exposed to atmospheric air for some time : (i) Silver, (ii) Copper and (iii) Iron$
Question 3
2025
28 (a) $With the help of an activity, explain the conditions under which iron articles get rusted.$
Question 4
2025
28 (a) $Observe the following diagram showing an experiment to determine the conditions under which a metal ‘M’ corrodes. List your observations in each of the three cases A, B and C with reason, if the metal ‘M’ is generally protected against corrosion by the method of galvanisation.$
Question 5
2025
3 $Which one of the following metals is protected from corrosion by a layer of its own oxide ?$
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Question 6
2026
23 $Galvanization is a process of coating iron articles with a thin layer of zinc to prevent iron from rusting. The iron is protected even if the zinc coating is scratched and iron is exposed. Which of the following is/are true about how zinc prevents the rusting of iron ? (P) A galvanised iron article does not undergo oxidation. (Q) The zinc coating prevents contact of iron with air. (R) Zinc provides continuous protection to iron from rusting.$
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Question 1