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BITSAT2011Chemistrys Block ElementsActual

When a crystal of caustic soda is exposed to air, a liquid layer is deposited because :

Options

  1. ACrystal loses water
  2. BCrystal absorbs moisture and CO ₂
  3. CCrystal melts
  4. DCrystal sublimes

Correct answer

B. Crystal absorbs moisture and CO ₂

Step-by-step solution

It is hygroscopic and deliquescent and hence absorbs moisture and CO ₂ to form Na ₂ CO ₃ 2 NaOH + CO ₂ Na ₂ CO ₃+ H ₂ O

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