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NCERT Exemplar Solutions Class 9 Science Solutions for Is Matter Around Us Pure ? - Exercise in Chapter 2 - Is Matter Around Us Pure ?
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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
(a) (i), (ii) and (iii)
(b) (i), (ii) and (iv)
(c) (i), (iii) and (iv)
(d) (ii), (iii) and (iv)
Answer:
Answer is (c) (i), (iii) and (iv)
Explanation
Rusting of iron is a chemical process where iron reacts with water and oxygen to produce iron oxide whereas other processes are physical changes.
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