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प्रश्न
Which of the following are physical changes?
(i) Melting of iron metal
(ii) Rusting of iron
(iii) Bending of an iron rod
(iv) Drawing a wire of iron metal
विकल्प
(i), (ii) and (iii)
(i), (ii) and (iv)
(i), (iii) and (iv)
(ii), (iii) and (iv)
उत्तर
(i), (iii) and (iv)
Explanation:
Melting of iron metal, bending of an iron rod and drawing a wire of iron metal is physical changes since no new substances are formed during these changes. Only rusting of iron is a chemical change since new substance rust is formed.
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