Which of the following metal oxide is referred as rust?
A
Iron oxide
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B
Calcium oxide
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C
Sodium oxide
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D
Copper oxide
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Solution
The correct option is A Iron oxide The metal oxide that is referred to as rust is iron oxide. It is usually the red oxide formed by the redox reaction of iron and oxygen in the presence of water or air moisture. Rusting is the common term for corrosion of iron.