Which of the following is an amphoteric oxide ? (A) Na_2O (B) K_2O (C) CO_2 (D) Al_2O_3

ScienceCBSE Class 10 · Board exam 2026, set 31/5/1 · 1 mark · MCQ

CBSE Class 10 Science 2026: question 19

Set in the CBSE Class 10 board exam of 2026, paper 31/5/1, section B, question 19, for 1 mark. Try it first; the hints and our step-by-step solution are below.

Q19 · 1 mark · MCQMetals and Non-metals

Which of the following is an amphoteric oxide ?

(A) $N a_{2} O$
(B) $K_{2} O$
(C) $C O_{2}$
(D) $A l_{2} O_{3}$

Source: official question paper from cbse.gov.in (PDF). See it in the full 2026 board paper, set 31/5/1.

Hints

Open one hint at a time and try again before the next.

Hint 1

An amphoteric oxide reacts with both acids and bases.

Hint 2

Oxides of non-metals are acidic. Among metal oxides, which one is the exception?

Step-by-step solution

Each step shows the marks it earns, as an examiner would award them. Checked by an independent re-solve from the question paper.

$A l_{2} O_{3}$ reacts with acids and also with bases to form salt and water, so it is amphoteric.
1 mark
$N a_{2} O$ and $K_{2} O$ are basic oxides, and $C O_{2}$ is acidic. Answer: (D).

Answer: (D) Al₂O₃

Where the marks are

Identifies Al₂O₃ (1 mark)

Revise the chapter

Chapter: Metals and Non-metals (notes, formulas, where marks are lost and every past question)

Practise this chapterBoard-style questions from Metals and Non-metals, one at a time, marked against the answer key and marking points.Back to the full paper2026 board paper, set 31/5/1: every question, by section.

The question is transcribed from the official paper; figures are described in words. The solution, hints and chapter tag are ours. Spotted an error? Write tosupport@questionbuddy.in.

CBSE Class 10 Science 2026: question 19

Hints

Step-by-step solution

Revise the chapter

More questions from Metals and Non-metals