A black coloured magnetic compound X is formed when iron reacts with oxygen or air. What is X?

FeCl₂

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FeSO₄

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Fe₃O₄

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Fe₂ (SO₄)₃

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Solution

The correct option is C
Fe₃O₄

Reaction with air or oxygen: On heating in air, iron forms magnetic oxide. This magnetic oxide is black in colour.

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

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{F e}_{2} O_{3}

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What is formed when hot copper reacts with oxygen in air?

B_{2} H_{6}

K^{+}

A l^{3 +}

S O_{4}^{2 -}

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