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The natural sources of oxalic… (Class 10 Science 2026, Q22)

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

CBSE Class 10 Science 2026: question 22

Set in the CBSE Class 10 board exam of 2026, paper 31/1/1, section B, question 22, for 1 mark. Try it first; the hints and our step-by-step solution are below.

Q22 · 1 mark · MCQAcids, Bases and Salts

The natural sources of oxalic acid, lactic acid and methanoic acid respectively are:

  1. (A)tomato, curd, ant-sting
  2. (B)tomato, orange, nettle-sting
  3. (C)orange, milk, ant-sting
  4. (D)orange, sour milk, nettle-sting

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

Hints

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

Hint 1

Orange contains citric acid.

Hint 2

Lactic acid is formed when milk sours.

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.

  1. Oxalic acid is found in tomato, lactic acid in curd (sour milk), and methanoic acid in ant sting (and nettle sting).

  2. Only option (A) gives all three sources correctly and in the right order. Option (B) is wrong because orange contains citric acid, not lactic acid. Correct option: (A).

    1 mark

Answer: tomato, curd, ant-sting, option (A)

Where the marks are

  • Matches all three acids correctly (1 mark)

Revise the chapter

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 paper2026 board paper, set 31/1/1: 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.