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ICSE Class 10 Chemistry Question 6 of 23

Solved 2025 Specimen Paper ICSE Class 10 Chemistry — Question 9

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9
Question

Question 1(ix)

A nitrate which forms a precipitate with ammonium hydroxide and is also soluble in excess of it:

  1. ferrous nitrate
  2. ferric nitrate
  3. lead nitrate
  4. copper nitrate
Answer

copper nitrate

Reason — When copper nitrate reacts with ammonium hydroxide NH4OH, it initially forms a light blue precipitate of copper(II) hydroxide (Cu(OH)2).
This precipitate is soluble in excess ammonium hydroxide due to the formation of a deep blue complex, tetraamminecopper(II) ([Cu(NH3)4]2+), making it soluble.