a drop of water is poured over a white powdery substance.then it is observed that the substance turns blue .
    what is the white powdery substance 
  2.why does the substance change to blue colour
  3.write chemical formula of blue substance
 4.is the blue substance is an acidic salt or basic salt
5.give reason for  your answer in 4


1. The white powder is anhydrous copper sulphate.

2. Blue substance is hydrated copper sulphate.

3. CuSO4.5H2O is the chemical formula blue hydrated copper sulphate.

4. It is a salt, neither acidic nor base. This is because it is found by the combination of Cu(OH)2 and H2SO4.


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