A colourless organic compound X was burnt in excess air to give two colourless and odourless gases, Y and Z, as products. X does not decolorize blue bromine vapour, Y turns lime milky while Z gives a blue colour with copper (ll) tetraoxosulphate (IV).
Y and Z are respectively?
CO2 and NH3
CO and NH3
SO2 and H2O
CO2 and H2O
SO2 and NH3
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The reaction between copper(II) ions and aqueous ammonia will create a beautiful blue color of aqueous copper(II) ions.
An example would be to combine copper(II) sulfate and ammonia solution.
When water is present in a sample of copper(II) sulfate it turns blue. It is still a dry solid, because the individual water molecules are trapped within the ionic lattice surrounding the copper(II) ions. Solutions of copper(II) sulfate are also blue.
