When sodium hydroxide solution is added to copper sulphate solution, a blue precipitate of copper hydroxide is formed along with sodium sulphate solution. What kind of chemical reaction takes place between them?
The correct option is A
Chemical double displacement reaction.
The reaction undergoing is:2NaOH+CuSO4→Na2SO4+Cu(OH)2
A double displacement reaction is a chemical reaction between two compounds in which constituents of each compound are interchanged to form two new compounds (AB+CD=AD+CB), so the reaction is a double displacement reaction.