Which one among the following substances is a compound ?

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Sugar

Air

Milk

Tea

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This question was previously asked in

UPSC CDS-2 – 2023

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A compound is a substance formed when two or more different elements are chemically bonded together in a fixed ratio. A mixture is a substance composed of two or more components physically mixed, where each component retains its individual properties and the composition can vary.

Sugar (commonly sucrose, C₁₂H₂₂O₁₁) is made up of Carbon, Hydrogen, and Oxygen atoms chemically combined in a fixed ratio. Therefore, sugar is a compound. Air is a mixture of gases like nitrogen, oxygen, argon, carbon dioxide, etc. Milk is a complex mixture of water, fats, proteins, carbohydrates, minerals, etc. Tea is an aqueous mixture containing compounds extracted from tea leaves.

Elements are pure substances consisting only of atoms that all have the same number of protons in their atomic nuclei. Compounds can be broken down into simpler substances (elements) by chemical means, while mixtures can be separated into their components by physical means.

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