Can someone please explain how you can tell whether or not the following elements are able to be prepared?
Zinc metal can be prepared by electrolysis of its aqueous salts
Cobalt metal can be prepared by electrolysis of its aqueous salts
Cadmium metal can be prepared by electrolysis of its aqueous salts
Hydrogen can be prepared by suitable electrolysis of aqueous magnesium salts
Hydrogen CANNOT be prepared by suitable electrolysis of aqueous zinc salts
Hydrogen can be prepared by suitable electrolysis of aqueous aluminum salts
Hydrogen CANNOT be prepared by suitable electrolysis of aqueous silver salts
Barium metal CANNOT be prepared by electrolysis of its aqueous salts
Lead metal can be prepared by electrolysis of its aqueous salts
Nitrogen CANNOT be prepared by electrolysis of an aqueous nitrate solution
