Question

Why metallic oxides are basic?

Answer 1

here is your answer
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metallic oxides are basic in nature because they react with dilute acids to form salt and water .they also react with water to form metal hydroxides which are alkaline in nature because this metal hydroxides release OH-ions in solution. therefore non metallic oxides will be acidic in nature .

Answer 2

Metallic oxides are basic in nature because-:
Metal+O2=Basic oxide
they react with dilute acids to form salt and water.