(a(i))[1]
Suggest why chromium is produced by electrolysis rather than by reducing chromium(VI) oxide, $\text{CrO}_3$, with carbon.
(a(ii))[2]
Suggest the products formed during the electrolysis of molten chromium(VI) oxide at: • the positive electrode • the negative electrode
(b(i))[1]
How does this equation indicate that chromium(III) oxide is reduced?
(b(ii))[1]
Explain how this diagram demonstrates that the reaction is exothermic.
(c)[2]
Describe two ways in which chromium's properties differ from sodium's.
(d(i))[2]
On the diagram, label: • the cathode • the electrolyte.
(d(ii))[1]
Give one observation seen during the electroplating process.
(d(iii))[1]
Suggest one reason why metal objects are electroplated.
(e)[1]
Which one of these diagrams, J, K, L or M, most closely represents nichrome?