The phenomenon in which white transparent crystal changes into white powder is called :

Deliquescence

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Efflorescence

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Allotropy

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Sublimation

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Solution

The correct option is B Efflorescence
Efflorescence is a phenomenon in which white transparent crystal changes into a white powder. Efflorescences can occur in natural and built environments. On porous construction materials it may present a cosmetic problem only, but can sometimes indicate serious structural weakness.

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