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Question 880005
JEE Chemistry · Medium

s-Block Elements: Compounds MCQ

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CompoundsMediumQuestion 880005

Question

Washing soda (Na₂CO₃·10H₂O) loses water on exposure to air. This process is called:
  1. A
    Efflorescence
    Correct
  2. B
    Deliquescence
  3. C
    Hygroscopy
  4. D
    Sublimation

Correct answer

Efflorescence

Explanation

Efflorescence: loss of water of crystallisation on exposure to air. Na₂CO₃·10H₂O (washing soda) → Na₂CO₃·H₂O (white powder). Deliquescence: absorption of moisture from air to form solution (NaOH, CaCl₂).

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