1. State whether the following statements are True or False. (i) During the electrolysis of aqueous solution of sodium chloride, sodium ions are discharged at cathode.
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Answer:
Sodium chloride (NaCl) and water (H
2
O) ionize as follows :
NaCl⇌Na
+
+Cl
−
and H
2
O⇌H
+
+OH
−
At cathode
Both Na
+
and H
+
are present near the cathode. But the discharge potential of H
+
is lower than that of Na
+
ion. So H
+
ions are discharged in preference to Na
+
ions.
H
+
+e
−
⟶H
H+H⟶H
2
Thus H
2
gas is liberated at the cathode and Na
+
remain in the solution.
Explanation:
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