Which conditions are necessary for rusting?

Oxygen

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Sunlight, water and metal

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Water, oxygen, a metal

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Metal and oxygen

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Solution

The correct option is C Water, oxygen, a metal
Rusting takes place when there is contact between water, metal, and oxygen.
$4 F e + 3 O_{2} + 2 n H_{2} O ⟶ 2 {F e}_{2} O_{3} . n H_{2} O$
(Iron) (oxygen) (water) (rust)

Hence the option C is correct.

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