Which of the following processes involves a chemical change?

Melting of ice

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Photosynthesis

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Beating of aluminium sheet to make foil

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Melting of wax

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Solution

The correct option is B Photosynthesis
$(A)$ Melting of ice is reversible, $∴$ physical change also no change in chemical composition.
$(B)$ ${6 C O}_{2} + 12 H_{2} O \to C_{6} H_{12} O_{6} + O_{2} + H_{2} O$
(chemical change)
$(C)$ malleability $-$ turning into this sheet $-$ physical change as no change in chemical composition.
$(D)$ similarly wax melting can be reversed.

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Similar questions

Classify the changes involved in the following processes as physical or chemical changes:

(a) Photosynthesis

(b) Dissolving sugar in water

(d) Melting of wax

(e) Beating aluminium to make aluminium foil

(f) Digestion of food

Which of the following does not involve a chemical reaction ?

(a) digestion of food in our body

(b) process of respiration

(d) melting of candle wax on heating

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