Show that metal oxides Al2O3 and ZnO are amphoteric in nature .

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Solution

ZnO and Al₂O₃ are amphoteric oxides as they react with both acids and bases. It means , it possesses both acidic and basic properties.
Al₂O₃ + 6HCl ----------> 2AlCl₃ + 3H₂(reaction with acid)
Al₂O₃ + 2NaOH â†’ 2NaAlO₂ + H₂O (reaction with base)
ZnO + 2HCl ----> ZnCl₂ + H₂O (reaction with acid)
ZnO + 2NaOH + H₂O -----> Na₂ [Zn (OH)₄](reaction with base)

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Similar questions

State True or False.

Some metal oxides are acidic or amphoteric in nature.

Q. Classify the following oxides into acidic, basic and amphoteric.

C a O

M g O

C O_{2}

S O_{3}

N a_{2} O

Z n O

A l_{2} O_{3}

F e_{2} O_{3}

(a) What are amphoteric oxides? Give two examples of amphoteric oxides.
(b) Choose the acidic oxides, basic oxides and neutral oxides from the following:
$N a_{2} O : C O_{2}; C O; S O_{2}; M g O; N_{2} O; H_{2} O .$
(c) Which of the following are amphoteric oxides:
$M g O, Z n O, P_{2} O_{3}, A l_{2} O_{3}, N O_{2}$

Q. Find the number of amphoteric oxide(s) from the following

N i O, A l_{2} O_{3}, B_{2} O_{3}, P b O_{2}, Z n O, M g O

Q. A metal X reacts with oxygen gas to form an amphoteric oxide. Identify the metal. Recall that amphoteric oxides show both acidic and basic behaviour.

X + O_{2} \to Amphoteric Oxide

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