Why are oxides of all metals called basic?

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Solution

Metallic oxides are basic nature because the oxides of metals such as MgO or CaO or $N a_{2} O$ form hydroxides in their aqueous solutions. For example:
$K_{2} O + H_{2} O \to 2 K O H | K_{2} O + H_{2} O$
$M g O + H_{2} O \to M g (O H)_{2} | M g O + H_{2} O \to M g (O H)_{2}$
Metal oxides like CaO and $N a_{2} O$ react with water and give hydroxides:
$C a O + H_{2} O \to C a (O H)_{2}$
$N a_{2} O + H_{2} O \to 2 N a O H$
While non-metal oxides like $C O_{2}$ and $S O_{2}$ react with water and give acids:
$C O_{2} + H_{2} O \to H_{2} C O_{3} \to H^{+} + H C O_{3}$
$S O_{2} + H_{2} O \to H_{2} S O_{3} \to H^{+} + H S O_{3}$

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