When a substance is heated, its density

Increase

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Decrease

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Remains same

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Solution

The correct option is B
Decrease

Explanation for the correct option
(B) Decreases
When a substance is heated, the volume expands, and the density falls as the intermolecular space expands.
When water is heated, its volume reduces, and its density rises as a result. This is a rare occurrence known as anomalous water expansion.
Hence, the correct option is (B).
Explanation for the incorrect options
Since, the density decreases when a substance is heated. Therefore, options (A), (C) stand incorrect.
Therefore, the correct answer is (B) Decreases.

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