Question

make a distinction between metals and non metals with respect to the nature of their oxide

Answer 1

Metals form metallic oxides which when dissolve in water yield bases
Nonmetals form nonmetallic oxides which when dissolved in water form acids

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Answer 2

1-Metals are electropositive.

2-These are alkaline oxides that make alkalis when dissolves in water.

3-examples:Na2O+H2O-2NaOH

1-Non metals are electronegetive.

2-These make acidic oxides that make acids when dissolved in water.

3-Example CO2+H2O-H2CO3