A metal 'X' is used in thermite process. When X is burnt in air it gives an amphoteric oxide 'Y'. 'X' and 'Y'…

Question

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 :

Accepted Answer

## 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

Science (086) — CBSE Class 10 board question