Which of the following process involves chemical reaction?

Formation of ice from water

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Respiration

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Compression of sponge

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Cutting of tree

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Solution

The correct option is B Respiration
The respiratory reaction is an example of chemical change. Respiration is a form of oxidation.

Glucose is oxidized to $C O_{2}$ and $H_{2} O$ (along with the release of energy) at the cells by the oxygen from the air we breathe in.

$C_{6} H_{12} O_{6} + 6 O_{2} \to 6 C O_{2} + 6 H_{2} O$

Since glucose is converted into new products with different composition, respiration is a chemical change.

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