The red or orange coating that forms on the surface of iron when exposed to air and moisture for some time is called:

Galvanisation

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Electroplating

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Rust

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Reduction

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Solution

The correct option is C Rust
Corrosion is the formation of metal oxide when exposed to moist air. Rust is iron oxide. Corrosion occurs in the presence of moisture. For example, when iron is exposed to moist air, it reacts with oxygen to form $r u s t (F e_{2} O_{3} . x H_{2} O)$ .

Hence, option $C$ is correct.

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Similar questions

The correct formula for the red or orange coating that forms on the surface of iron when exposed to air and moisture, consisting chiefly of ferric hydroxide and ferric oxide formed by oxidation called as rust is

When a vessel is exposed to moist air for a long time,then a green coating is formed on its surface.The vessel must be made of :

(a) zinc

(b) magnesium

(d) copper

When a copper object is exposed to moist air for a long time,then a green coating is formed on its surface.

(a) What is the material of the green coating ?

(b) State whether the green coating is acidic or basic.

Iron when exposed to moisture and air, it gradually changes by process of

Q. Assertion :Rusting of iron is considered an oxidation reaction. Reason: Rust is another name for iron oxide which occurs when iron is exposed to oxygen and moisture for a long period of time. Overtime the oxygen combines with the metal at atomic level forming a compound called an oxide. Rust forms when iron undergoes oxidation. The main catalyst for the rusting process is water.

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The red or orange coating that forms on the surface of iron when exposed to air and moisture for some time is called:

The correct option is C RustCorrosion is the formation of metal oxide when exposed to moist air. Rust is iron oxide. Corrosion occurs in the presence of moisture. For example, when iron is exposed to moist air, it reacts with oxygen to form rust(Fe2O3.xH2O).Hence, option C is correct.