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)
• B. (ii) and (iii)
• C. only (ii)
• D. (i) and (iii)

Answer 1

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).