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Q.

Rust is a/an :

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a

Basic oxide

b

Acidic oxide

c

Neutral oxide

d

Basic nitrate

answer is B.

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Detailed Solution

In the presence of both air and moisture iron reacts with then slowly and forms hydrated ferric oxide which is metallic oxide with basic nature.

$4 F e + 3 O_{2} \to 3 F e_{2} O_{3}$

$F e_{2} O_{3} + x H_{2} O \to F e_{2} O_{3} . x H_{2} O$

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Rust is a/an :