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ICSE Class 10 Chemistry Question 2 of 24

Solved 2023 Question Paper ICSE Class 10 Chemistry — Question 6

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6
Question

Question 1(vi)

The metallic hydroxide which forms a deep inky blue solution with excess ammonium hydroxide solution is:

  1. Fe(OH)2
  2. Cu(OH)2
  3. Ca(OH)2
  4. Fe(OH)3
Answer

Cu(OH)2

Reason — Cu(OH)2 reacts with a solution of excess ammonium hydroxide to form a deep blue solution of tetrammine copper [II] sulphate.

Cu(OH)2 + (NH4)2SO4 + 2NH4OH ⟶ [Cu(NH3)4]SO4 + 4H2O