(a) What are amphoteric oxides? Give two examples of amphoteric oxides.
(b) Choose the acidic oxides, basic oxides and neutral oxides from the following:
Na₂O; CO₂; CO; SO₂; MgO; N₂O; H₂O.
(c) Which of the following are amphoteric oxides:
MgO, ZnO, P₂O₃, Al₂O₃, NO₂

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Solution

(a) Amphoteric oxides are those metal oxides which show basic as well as acidic behaviour. They react with acids as well as bases to form salts and water. Aluminium oxide and zinc oxide are examples.

(b) Acidic oxides: CO₂and SO₂
Basic oxides: Na₂O and MgO
Neutral oxides: N₂O, CO and H₂O

(c) ZnO and Al₂O₃ are the amphoteric oxides.

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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}

Out of the following oxides, the amphoteric oxide is :
(a) $F e_{2} O_{3}$ (b) $A l_{2} O_{3}$ (c) $P_{2} O_{3}$ (d) $N_{2} O$

What are oxides ? Give two examples of each of the following oxides.

(a) Basis oxide (b) Acidic oxide

What are amphoteric oxides? Give two examples of amphoteric oxides.

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

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