Why the grills of doors and windows are always painted before used?

To look beautiful

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To avoid corroison

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To protect from rain

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To protect from sunlight

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Solution

The correct option is B To avoid corroison
Usually, grills of doors and windows are made of iron and iron objects get rusted on exposure to moist air. Since air always contains moisture, iron grills get rusted.

Painting iron objects prevents rusting, hence iron grills of doors and windows are painted before they are used.

Hence, option B is correct.

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Similar questions

Give scientific reasons:

(1) Grills of doors and windows are always painted before they are used.

(2) Physical states of reactants and products are mentioned while writing a chemical equation.

(3) Potassium Ferrocyanide is stored in dark coloured bottles and kept away from sunlight.

(4) Iron articles rust readily whereas steel which is also mainly made of iron will not undergo corrosion.

(5) Edible oil is not allowed to stand for a long time in an iron or tin container.

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