Question

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 1 point (a) (i), (ii) and (iii) (b) (i), (ii) and (iv) (c) (i), (iii) and (iv) (d) (ii), (iii) and (iv)

Answer 1

hlo mate

➡ ure answer is option a)

✴Rusting of iron

✴Bending of an iron rod

✴Melting of iron metal

Answer 2

The correct option is b.

• The changes where the internal property of a substance or state does not change are called physical changes.
• On melting iron produces liquid iron here only the state of iron changes so, it is a physical change.
• Rusting of iron is a chemical change as ferric oxide is produced by the reaction of iron and oxygen.
• The bending of an iron rod and drawing a wire I iron metal does not change its internal properties so, it is a physical change.