Which one is correct among the following?
(a) Melting of wax is irreversible.
(b) Burning of wax is reversible.
(c) New substance is formed in chemical change. (d) Sand dissolves easily in water.
Answers
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Answer:
c). New substance is formed in chemical change.
Explanation:
A chemical reaction is a change in which one or more substances or reactants reacts to form a new substance.
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Answer:
(a) Photosynthesis → Chemical change
(b) Dissolving sugar in water → Physical change
(c) Burning of coal → Chemical change
(d) Melting of wax → Physical change
(e) Beating aluminium to make aluminium foil → Physical change
(f) Digestion of food → Chemical change
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