ScienceCBSE Class 10 · Board exam 2024, set 31/2/1 · 1 mark · MCQ

CBSE Class 10 Science 2024: question 4

Set in the CBSE Class 10 board exam of 2024, paper 31/2/1, section A, question 4, for 1 mark. Try it first; the hints and our step-by-step solution are below.

Q4 · 1 mark · MCQAcids, Bases and Salts

The oxide which can react with $HCl$ as well as $KOH$ to give corresponding salt and water is

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

Source: official question paper from cbse.gov.in (PDF). See it in the full 2024 board paper, set 31/2/1.

Hints

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

Hint 1

What do we call an oxide that reacts with both acids and bases?

Hint 2

Aluminium oxide and zinc oxide are the standard examples.

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.

An oxide that reacts with both an acid (HCl) and a base (KOH) to give salt and water is an amphoteric oxide.
½ mark
$A l_{2} O_{3} + 6HCl \to 2AlC l_{3} + 3 H_{2} O$ and $A l_{2} O_{3} + 2KOH \to 2KAl O_{2} + H_{2} O$ . CuO, $N a_{2} O$ and $K_{2} O$ are basic oxides. So the answer is option (B).
½ mark

Answer: $A l_{2} O_{3}$ : option (B)

Where the marks are

Identifies amphoteric $A l_{2} O_{3}$ , option (B) (1 mark)

Revise the chapter

Chapter: Acids, Bases and Salts (notes, formulas, where marks are lost and every past question)

Practise this chapterBoard-style questions from Acids, Bases and Salts, one at a time, marked against the answer key and marking points.Back to the full paper2024 board paper, set 31/2/1: every question, by section.

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CBSE Class 10 Science 2024: question 4

Hints

Step-by-step solution

Revise the chapter

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