Which among the following is a pure substance?

Soft drink

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Lemonade

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Muddy Water

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Salt crystals

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Solution

The correct option is D
Salt crystals

A pure substance consists of only a single type of particle. The constituent particles of a pure substance are the same in their chemical nature.

Salt is a pure substance as it has the same chemical composition ( $N a C l$ ) throughout.
Substances like lemonade, muddy water, and soft drinks are mixtures.

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