Tick (✓) the most appropriate answer.
In which of the following formation of substances need energy change necessarily?

Element

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Compound

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Mixture

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All of these

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Solution

The correct option is B
Compound

When one or more atoms of the same or different elements combine with each other chemically, a compound is formed.
For example - Water, Sugar, Sodium chloride, etc.
As a chemical compound involves a chemical bond formation. Hence, energy change takes place.
Hence option B is correct.

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