Chemistry
Starting from aq. copper (II) sulphate solution, give equations for the reactions at the cathode and anode during electrolysis of aq. CuSO4 using active copper electrodes.
Related Questions
State the reason for difference in product formed at the anode during electrolysis of aq. CuSO4 using :
(i) active electrode — copper anode
(ii) inert electrode — platinum anode.
Give the electrode reactions for formation of
(i) Lead metal and bromine vapours from molten PbBr2 using inert electrodes
(ii) H2 and O2 gas [2:1] from acidified water using inert Pt electrodes.
Give reasons for the following changes —
(i) pure water a non-electrolyte — becomes an electrolyte on addition of dil. H2SO4
(ii) Blue colour of aq. CuSO4 — turns almost colourless on it's electrolysis using Pt electrodes.
'Iron is electroplated with silver' —
(i) define the term in italics
(ii) state two reasons for electroplating
(ii) state why the iron is not placed at the anode and silver at the cathode during electroplating.