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Question

Answer the following question:
(a) What happens when a dilute acid reacts with a metal oxide? Explain with the help of an example.
(b) Do metal oxides react with bases too? If yes, give an example.

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Solution

(a) Metal oxides are basic in nature. Acids react with metal oxides to form salt and water.
Example: Dilute sulphuric acid reacts with calcium oxide to form calcium sulphate and water.
CaO(s)+H2SO4(aq)CaSO4(aq)+H2O(l)
Salt Water

(b) Yes, there are a few oxides of amphoteric metals such as zinc and aluminium which react with acids as well as bases too.
Reaction with acid:
Al2O3(s)+6HCl(aq)2AlCl3(aq)+3H2O(l)
Acid

Reaction with base:
Al2O3(s)+2NaOH(aq)2NaAlO2(aq)+H2O(l)
Base

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