(A) A student took a small amount of copper oxide in a conical flask and added dilute hydrochloric acid to it with constant stirring. He observed a change in colour of the solution.
(i). Write the name of the compound formed and its colour.
(ii) Write a balanced chemical equation for the reaction involved.
OR
(B) The industial process used for the manufacture of caustic soda involves electrolysis of an aqueous solution of compound ' X '. In this process, two gases ' Y ' and ' Z ' are liberated. ' Y ' is liberated at cathode and ' Z ', which is liberated at anode, on treatment with dry slaked lime forms a compound ' B '. Name X,Y, Z and B .