Q1. [1] § 3.1 PHYSICAL PROPERTIES § 3.2 CHEMICAL PROPERTIES OF METALS § 3.4 OCCURRENCE OF METALS
A metal, M, displaces iron from aqueous solution of ferrous sulphate but fails to do so in case of aqueous solution of aluminium sulphate. The metal M is
- A Magnesium
- B Copper
- C Lead
- D Zinc
Previously asked in CBSE board exam
2025 31/5/1 Q2
Generated by claude-sonnet-4-6 · 2026-06-15 06:48 · grounding rag
Model Answer
Option D — Zinc
Zinc is more reactive than iron but less reactive than aluminium in the activity series, so it displaces Fe from FeSO₄ but cannot displace Al from Al₂SO₄.
Explanation
The activity series order is: Al > Zn > Fe > Cu. A metal displaces only those metals that are below it in the series. Zinc is below aluminium (cannot displace it) but above iron (can displace it). Magnesium is above both, so it would displace both. Copper and Lead are below iron, so they cannot displace iron either. Zinc is the only option that fits both conditions in the question.
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