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Science — CBSE Class 10 board question

Q1. [1]
A metal 'X' is used in thermite process. When X is burnt in air it gives an amphoteric oxide 'Y'. 'X' and 'Y' are respectively :
  1. (a) Fe and Fe₂O₃
  2. (b) Al and Al₂O₃
  3. (c) Fe and Fe₃O₄
  4. (d) Al and Al₃O₄
Previously asked in CBSE board exam
2023 31/1/1 Q5
Generated by claude-sonnet-4-6 · 2026-06-15 06:50 · grounding rag
Model Answer

(b) Al and Al₂O₃

Aluminium (Al) is used in the thermite process. When burnt in air, it forms aluminium oxide (Al₂O₃), which is an amphoteric oxide — it reacts with both acids and bases.

Explanation

Key facts to remember: (1) Thermite process uses aluminium powder mixed with iron oxide. (2) Al₂O₃ is the classic example of an amphoteric oxide in CBSE Class 10. Option (d) is wrong because Al₃O₄ does not exist; the correct formula is Al₂O₃.

Source: Chapter 3, Section 3.2.1

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