A chemist opened a couborad and found four bottles contaning water solutions, each of which had lost its label. Bottles 1,2,3 contained colourless solutions, while bottle 4 contained a blue solution. The lables from the bottles were lying scattered on the floor of the cupboard. They were:Copper (II) sulphate,""Hydrochloric acid Lead nitrate,""Sodium carbonate By mixing samples of the contents of the bottles, in pairs the chemist made the following observations: {:("Bottle +1 Bottle" 2 rarr, "White precipitate is formed"),("Bottle 1+ Bottle"3 rarr,"White precipitate is formed"),("Bottle 1+ Bottle" 4rarr,"White precipitate is formed"),("Bottle2+ Bottle"3rarr,"Colourless and odourless gas is evolved"),("Bottle 2+ Buttel" 4rarr,"No visivle reaction is observed"),("Bottle 3+ Bottle" 4rarr,"Blue precipitate is formed"):} With the help of the above observations answer the following questions. Bottle 3 contains: