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Q55 (CDS-I/2025) Science & Technology › Basic Science (Physics, Chemistry, Biology) › Basic chemical principles Answer Verified

Which one of the following is considered as a compound ?

Result
Your answer: —  Â·  Correct: D
Explanation

Matter is classified into elements, compounds, and mixtures [1]. Elements are the simplest substances consisting of only one kind of atom and cannot be broken down further [1]. Silicon and Tin are both elements found on the periodic table [1]. A mixture consists of two or more substances mixed together where each retains its individual properties; sugar solution is a homogeneous mixture of sugar (solute) and water (solvent) [2]. A compound is a substance composed of two or more elements chemically combined in a fixed ratio, possessing properties different from its constituent elements [1]. Calcium carbonate (CaCO3) is an ionic chemical compound consisting of calcium, carbon, and oxygen atoms in a fixed 1:1:3 ratio. Therefore, calcium carbonate is the only compound among the given options.

Sources

  1. [1] Science ,Class VIII . NCERT(Revised ed 2025) > Chapter 8: Nature of Matter: Elements, Compounds, and Mixtures > Snapshots > p. 130
  2. [2] Science ,Class VIII . NCERT(Revised ed 2025) > Chapter 8: Nature of Matter: Elements, Compounds, and Mixtures > 8.1 What Are Mixtures? > p. 117
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