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WAEC - Chemistry (2004 - No. 24)
The reaction that takes place at the cathode when an aqueous solution of NaCI is electrolysed using carbon electrodes is
2H
+
2(g)
+ 2e
-
→ H
2(g)
Na
+
2(g)
+ e
-
→ Na
(s)
4OH
-
→ 2H
2
O
(l)
+ O
2(g)
+4e
-
2CI
-
→ CI
2(g)
+ 2e
-
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