Question

chemistry questions......... Question 1-3

Answer 1

1))Nitric acid is an oxidising agent. Aluminium  after reacting with nitric acid oxidised into aluminium oxidised. So that after oxidation a layer of aluminium oxide form on the surface of  aluminium which prevent it from further reaction. Hence reactivity of the aluminium decreases when dipped in nitric acid.
2)) Na or Mg is more reactive then carbon.
3))in solid state ions are not present. so in solid state it don't conduct electricity. But in aquas or molten state ions are present so it conduct electricity .
4)) iron is more reactive so iron galvanised for prevent from rusting.
5)) These metal are more reactive so its never found in nature in free state.