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
WBBSE
Class X
Physical Science
Inorganic Chemistry
01 Mark
2026
(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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