Question

A) a solution of substance 'x' is used for white washing. What is the substance 'x'? State the chemical reaction of 'x' with water. (b) why does the colour of copper sulphate solution change when an iron nail is dipped in it?

Answer 1

Answer:

A) Substance 'X' is Calcium oxide.

H2O + CaO → Ca(OH)2+heat

B) The color of copper sulphate solution changes from blue to pale green when an iron nail is dipped in it because iron displaces copper as iron is ore reactive than copper.