Answer the following question:
(a) What happens when a dilute acid reacts with a metal oxide? Explain with the help of an example.
(b) Are there any metal oxides that react with both acids and bases? If yes, give an example.
[3 Marks]

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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.
$C a O (s) + H_{2} S O_{4} (a q) \to C a S O_{4} (a q) + H_{2} O (l)$
Salt Water
[1 Mark]

(b) Yes, there are a few oxides of amphoteric metals such as zinc and aluminium which react with acids as well as bases.
Reaction with acid:
$A l_{2} O_{3} (s) + 6 H C l (a q) \to 2 A l C l_{3} (a q) + 3 H_{2} O (l)$
Acid
[1 Mark]

Reaction with base:
$A l_{2} O_{3} (s) + 2 N a O H (a q) \to 2 N a A l O_{2} (a q) + H_{2} O (l)$
Base
[1 Mark]

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