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The oxide ions in a metal oxide generally react with water to form hydroxide ions which are basic in nature (OH-). Here's a complete reaction example :

The oxide ion tends to react with water to form hydroxide ions.

generically O2- + H2O --> 2OH-

As an example, CaO + H2O ---> Ca(OH)2

Some other metal oxides (like ZnO and Al2O3) are basic BUT also acidic oxides:

ZnO + H2O + 2 OH- --> Zn(OH)42- in which reaction hydroxide is needed and NOT formed! This behaviour is usually termed amphoteric.

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Related Questions

What is the nature of metal-oxide?

A metallic oxide is basic in nature.


How may the reaction with oxygen be used to distinguish a metal from a non metal?

When a metal reacts with oxygen, it forms a metal oxide which is basic in nature. This can be distinguished from a non-metal oxide, which is acidic in nature. This difference in the nature of oxides can be used to identify whether a substance is a metal or non-metal.


How do you prove metal oxide is basic?

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If calcium reacts with oxygen is the oxide formed an acid or base?

Calcium oxide is definitely a base forming oxide, only nonmetals can have acidic oxides, though some other metal (amphoteric) oxides are also (mainly weak) acid forming oxides.


Is strontium oxide a metal?

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Is gold oxide an acid or a base?

Gold oxide is neither an acid nor a base. It is a metal oxide, which means it is a compound that contains a metal (gold) and oxygen. Metal oxides tend to be basic in nature, meaning they can react with acids to form salts and water.


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Is potassium oxide is a metal or nonmetal?

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What is formed when a metal oxide react with water?

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Is cobalt oxide a base or a salt?

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