Question 4 — In which of the - Questions at the end of the chapter - Chapter 8 Class 8 - Nature of Matter: Elements, Compounds (Curiosity)

Last updated at June 17, 2026 by

Q 4
Question

In which of the following cases are all the examples correctly matched? Give reasons in support of your answers.

  • (i) Elements — water, nitrogen, iron, air.
  • (ii) Uniform mixtures — minerals, seawater, bronze, air.
  • (iii) Pure substances — carbon dioxide, iron, oxygen, sugar.
  • (iv) Non-uniform mixtures — air, sand, brass, muddy water.
Show answer Hide answer
Answer
Option (iii) is correctly matched.

Explanation

Option Correct? Reason
(i) Elements No Water and air are not elements.
(ii) Uniform mixtures No Minerals are not uniform mixtures.
(iii) Pure substances Yes Carbon dioxide, iron, oxygen, sugar are all pure.
(iv) Non-uniform mixtures No Air and brass are uniform mixtures.
Only (iii) is fully correct — all four are pure substances (elements or compounds).
← Back to concept: 8.2 What Are Pure Substances?
Remove Ads Share on WhatsApp
CA Maninder Singh's photo - Co-founder, Teachoo

Made by

CA Maninder Singh

CA Maninder Singh is a Chartered Accountant with 16+ years of practical experience and 20+ years of teaching experience. At Teachoo, he simplifies Accounts, Tax and GST with step-by-step examples so students can apply concepts confidently in exams and real life.

For an uninterrupted learning experience, students can use Teachoo Black to remove ads and focus better.