Discuss the acidic and basic nature of metals and non-metals.

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Detailed Solution

Metals

Most metal oxides are basic. They neutralise acids to form salt and water.
Soluble basic oxides form metal hydroxides in water (often strongly alkaline for Group 1 & 2).
Amphoteric oxides such as Al₂O₃ and ZnO react with both acids and bases.

Na₂O + H₂O → 2 NaOH

Al₂O₃ + 6 HCl → 2 AlCl₃ + 3 H₂O

Al₂O₃ + 2 NaOH + 3 H₂O → 2 Na[Al(OH)₄]

Non-metals

Most non-metal oxides are acidic. They form acids with water and neutralise bases.
Some neutral oxides exist (e.g., CO, NO, N₂O) that are neither acidic nor basic.

SO₂ + H₂O ⇌ H₂SO₃

SO₂ + 2 NaOH → Na₂SO₃ + H₂O

Type	Typical Examples	Behaviour
Basic oxides (metals)	Na₂O, CaO, MgO	Form hydroxides; neutralise acids
Amphoteric oxides (metals)	Al₂O₃, ZnO	React with both acids and bases
Acidic oxides (non-metals)	CO₂, SO₂, SO₃	Form acids; neutralise bases
Neutral oxides (non-metals)	CO, NO, N₂O	Neither acidic nor basic

Metals generally give basic oxides/hydroxides (with amphoteric exceptions like Al₂O₃, ZnO), while non-metals generally give acidic oxides, with a few neutral oxides.

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