The questions fell a prey to most candidates who validly presented the required correct responses. However, few candidates gave factors affecting selective discharge of elements during electrolysis.
The expected answers are:
 (a)Any two correct factors
e.g
time
current/quantity of charge
nature/e.c.e of element.
(b)Any two correct non-electrolytes
e.g
water
kerosene
petrol
benzene
ethanol