Question

(b) Metal M reacts with oxygen to form metallic oxide (MO). This oxide reacts with moisture
and carbon dioxide of the atmosphere to form a basic carbonate. Metal M prevents
rusting of iron. Identify the metal M and explain how does it prevent rusting of iron​

Answer 1

Answer:

The metal is magnesium

Explanation:

The magnesium donates electrons to the iron, which slows down the rusting process. ... The magnesium corrodes instead of the iron, 'sacrificing' itself. This is called sacrificial protection, and is used commercially to protect iron structures in corrosive environments. The nail wrapped in copper will rust the most.

Answer 2

Answer:

Since the metal M forms the oxide MO, therefore

the metal (M) is divalent.

The metal (M) forms the basic carbonate

when exposed to moisture and carbon dioxide,

therefore, it must be copper.

2cu + co2 + o2+ h2o -------> cuco3 . cu(OH)2

Since copper is less electro-positive than iron, so

when iron is covered with a thin layer of copper,

it gets prevented from rusting.

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