The chemical formula of rust is $F e_{2} O_{3}$ .

True

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False

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Solution

The correct option is B False
Iron metal does not burn in dry air even on strong heating. In moist air iron is slowly oxidised to give rust (iron oxide).

$4 F e + 3 O_{2} \to 2 F e_{2} O_{3} + n H_{2} O \to F e_{2} O_{3} . n H_{2} O (R u s t)$

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Chemical formula of rust.

F e_{2} O_{3} . H_{2} O

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