Efflorescence in cement is caused due to the excess of

Silica

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Lime

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Iron oxide

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Alkalies

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Solution

The correct option is D Alkalies
Efflorescence in cement is caused due to an excess of alkali.
Efflorescence is the white powder substance on the surface of concrete caused by vapour migrating through the body of concrete bringing soluble salts alkali to the surface of the concrete.

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