2001 - WAEC Chemistry Past Questions and Answers - page 3
21
Which of the following substances decomposes when an electric current is passed through it?
A
Glucose solution
B
Zinc rod
C
Hydrochloric acid
D
Tetrachlormethane
22
A concentrated solution containing H+, Cu2+,OH- and CI- was electrolysed using platiunm electrodes which of the ions will be discharged at the cathods?
A
H+
B
Cu2+
C
OH-
D
CI-
23
Given that the order of reactivity of four metals is P>Q>R>S, which of the following reactions is feasible?
A
S + P+ → P + S +
B
Q + S+ → S + Q+
C
R + P+ → P + R+
D
S + Q+ → Q + S+
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