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What type of oxides are formed when metals combine with oxygen?

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Basic oxides

Acidic oxides

Amphoteric oxides

Cannot predict

answer is A.

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Detailed Solution

When metals get oxidised, they form basic oxides.
The process of addition of oxygen is called oxidation. In this process, electrons are lost.
For example, sodium is a metal and when it reacts with oxygen in air it forms Na2O. Na2O is a basic oxide.

4 Na + O_{2} \to 2 N a_{2} O

Likewise, potassium reacts with oxygen or gets oxidised to form a basic oxide called K2O.

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