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BITSAT 2011
Exam
BITSAT
Year
2011
Subject
Chemistry
Chapter
s Block Elements

BITSAT 2011 · Chemistry · s Block Elements

When a crystal of caustic soda is exposed to air, a liquid layer is...

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 CO2\mathrm{CO}_{2}
  3. CCrystal melts
  4. DCrystal sublimes

Correct answer

B. Crystal absorbs moisture and CO2\mathrm{CO}_{2}

Step-by-step solution

It is hygroscopic and deliquescent and hence absorbs moisture and CO2\mathrm{CO}_{2} to form Na2CO32NaOH+CO2⟶Na2CO3+H2O\mathrm{Na}_{2} \mathrm{CO}_{3} 2 \mathrm{NaOH}+\mathrm{CO}_{2} \longrightarrow \mathrm{Na}_{2} \mathrm{CO}_{3}+\mathrm{H}_{2} \mathrm{O}
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