Multiple choice

Efflorescent substance are those which

  1. dissolve themselves in the absorbed moisture

  2. absorb water vapour from the air

  3. absorb moisture from a gas

  4. lose their water of crystallisation
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D Correct answer
Explanation

The property by which certain hydrous crystals lose their water of crystallisation, completely or partially, when exposed to air and crumble into a powder is called efflorescence.for examples Na2SO4.10H2O.Such substances are termed as efflorescent substances.

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