QQuestion
What will be the colour of the solution formed when excess aqueous ammonia is added to aqueous copper sulphate solution?
(a) Yellow
(b) Orange
(c) Green
(d) Deep blue
✓Answer
(d) Deep blue
Explanation
When excess aqueous ammonia (NH₄OH) is added to copper sulphate (CuSO₄) solution, a deep blue solution is formed due to the formation of the tetraammine copper(II) complex.
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