Why is zinc and aluminum considered to have unique nature? Give balanced equations to support your answer.

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Solution

Zinc and aluminium are considered to have a unique nature for the following reasons: They can react with acids and alkali to form hydrogen and soluble salt.
For example:
$Z n + 2 N a O H \to N a_{2} Z n O_{2} + H_{2}$
$2 A l + 6 N a O H \to 2 N a_{2} A l O_{3} + 3 H_{2}$

ii) The oxides and hydroxides of zinc and aluminium are amphoteric. That is, they react with both bases and acids to give salt and water.
For example:
$Z n O + 2 H C l \to Z n C l_{2} + H_{2} O$
$Z n O + 2 N a O H \to N a_{2} Z n O_{2} + H_{2} O$
$A l_{2} O_{3} + 6 H C l \to 2 A l C l_{3} + 3 H_{2} O$
$A l_{2} O_{3} + 2 N a O H \to 2 N a A l O_{2} + H_{2} O$

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