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ICSE Class 10 Chemistry Question 4 of 23

Model Paper 2 — Question 8

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8
Question

Question 1(viii)

The drying agent used to dry Ammonia is:

  1. Concentrated Sulphuric acid
  2. Calcium oxide
  3. Sulphurous acid
  4. Calcium hydroxide
Answer

Calcium oxide

Reason — The drying agent used to dry Ammonia is quicklime or calcium oxide (CaO). Other drying agents like conc. sulphuric acid and sulphurous acid are not used, as ammonia being basic, reacts with them. Calcium hydroxide (slaked lime) is slightly basic, but less effective than calcium oxide in drying. It may also partially react with ammonia.