Q. 25.0( 3 Votes )
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 :
Rusting is a chemical change where iron and oxygen react together to make a new substance of completely different properties called iron oxide.
The chemical reaction is given as:
4Fe + 3O2 → 2Fe2O3
Rest all are physical changes.
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