Question

9. Give a reason why
a) Heating a platinum wire is a reversible change but, heating a magnesium wire is an
irreversible change.
b) Addition of zinc nitrate to water is a physical change but, addition of zinc to dilute nitric
acid is a chemical change.
c] Rusting of iron is a chemical change but, magnetization of iron is a physical change.
10. Select the chemical changes from the following list of changes​

Answer 1

Explanation:

a) A platinum wire is a reversible change because it can be reversed but heating a magnesium wire is an irreversible change because it cannot be reversed.Apr 27,