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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:

2Fe(s)Iron+H2O(g)Water+O2(g)OxygenFe2O3.xH2O(s)Ironoxide(Rust)

  • 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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