Q.

Which of the following metals form amphoteric oxide?

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a

Magnesium

b

Zinc 

c

Iron 

d

Sodium

answer is D.

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Detailed Solution

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Zinc is the metal that forms amphoteric oxide.
Zinc forms amphoteric oxides. Amphoteric oxides are those substances which can act as both acids and bases. 

Examples of metals forming amphoteric oxides are lead, zinc, beryllium and aluminium. Metals form amphoteric oxides or show the property of amphoterism because metals consist of variable oxidation states.
 Among other options, Iron forms mainly basic oxides, Sodium forms basic oxides, and Magnesium forms predominantly basic oxides.

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