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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)

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)

Answers (1)

Answer: C 

Solution: If a matter goes under a physical change its appearance might change but the substance of matter does not change. In a chemical change in a chemical change either one of the substance changes and comes with new properties. In melting, the state of metal will change but the substance will not change. In bending or drawing a wire appearance of the metal change but basic properties of substance will not change. When any article made up of iron get rusted, it gets converted in iron oxide it looks reddish brown in colour. As it is a change of the substance, it is a chemical change

4Fe+3O_{2}\rightarrow 2Fe_{2}O_{3}.xH_{2}O

Hence, the correct option is C.

 

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