Skip to content

Select a pair of natural… (Class 10 Science 2024, Q2)

questionbuddy.in/q/cbse-10-science-2024-31-3-1-q2-pair-natural-indicator

ScienceCBSE Class 10 · Board exam 2024, set 31/3/1 · 1 mark · MCQ

CBSE Class 10 Science 2024: question 2

Set in the CBSE Class 10 board exam of 2024, paper 31/3/1, section A, question 2, for 1 mark. Try it first; the hints and our step-by-step solution are below.

Q2 · 1 mark · MCQAcids, Bases and Salts

Select a pair of natural indicator from the following :

  1. (A)Litmus and methyl orange
  2. (B)Turmeric and Litmus
  3. (C)Phenolphthalein and methyl orange
  4. (D)Methyl orange and Turmeric

Source: official question paper from cbse.gov.in (PDF). See it in the full 2024 board paper, set 31/3/1.

Hints

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

Hint 1

Natural indicators are obtained from plants or lichens.

Hint 2

Methyl orange and phenolphthalein are made in laboratories.

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. Natural indicators come from plants or lichens. Litmus is extracted from lichen, and turmeric comes from the turmeric plant.

  2. Methyl orange and phenolphthalein are synthetic indicators. Only option (B), turmeric and litmus, has both indicators natural.

    1 mark

Answer: Turmeric and litmus, option (B)

Where the marks are

  • Chooses turmeric and litmus as the natural pair (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 paper2024 board paper, set 31/3/1: 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.