Question

# A man painted his main gate made up of iron, to i) prevent it from rusting. ii) protect it from the sun. iii) make it look beautiful. iv) make it dust-free. Which of the above statement(s) is/are correct?

A

(i) and (ii)

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B

(ii) and (iii)

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C

only (ii)

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D

(i) and (iii)

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Solution

## The correct option is D (i) and (iii)Explanation for the correct answer:-Option (D) Rusting of iron refers to the formation of rust over the surface of the Iron which results due to the contact of iron with the moisture present around it.The Iron oxidizes when it reacts with the water present in the moisture and thus forms Ferric(III) oxide which is the rust.The complete reaction is: $\underset{\mathrm{Iron}}{2\mathrm{Fe}\left(\mathrm{s}\right)}+\underset{\mathrm{Water}}{{\mathrm{H}}_{2}\mathrm{O}\left(\mathrm{g}\right)}+\underset{\mathrm{Oxygen}}{{\mathrm{O}}_{2}\left(\mathrm{g}\right)}\to \underset{\mathrm{Iron}\mathrm{oxide}\left(\mathrm{Rust}\right)}{{\mathrm{Fe}}_{2}{\mathrm{O}}_{3}.{\mathrm{xH}}_{2}\mathrm{O}\left(\mathrm{s}\right)}$The paint is done in order to prevent rusting.The paint forms a thin layer over the surface which prevents the contact of the moisture with the Iron thus preventing rusting.Due to the glossy nature of the paint, the main gate would look beautiful temporarily.Hence it is the correct option.Explanation for the incorrect answer:-Option (A) The sun does not do anything to the main gate.Meanwhile, the paint prevents the gate from rusting or corrosion.Hence it is the incorrect option.Option (B) Due to the glossy nature of the paint, the main gate would look beautiful temporarily.But the sun does not do anything to the main gate.Hence it is the incorrect option.Option (C) The sun does not do anything to the main gate.Thus this cannot be the only answer.Hence it is the incorrect option.Therefore, the statements that are correct are option (D) (i) and (iii).

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