Question

During the charging of lead storage battery, the reaction at anode is represented by

• A. $Pb ^{2+}+ SO _{4}^{2-} \longrightarrow PbSO _{4}$
• B. $PbSO _{4}+ H _{2} O \longrightarrow PbO _{2}+ SO _{4}^{2-}+2 H ^{+}$
• C. $Pb \longrightarrow Pb ^{2+}+2 e^{-}$
• D. $Pb ^{2+}+2 e^{-} \longrightarrow Pb$

Answer 1

Answer: (B)

The following reactions take place during the charging :

At Anode $: PbSO _{4(s)}+2 e^{-} \rightarrow Pb _{(s)}+ SO _{4(a q)}^{2-}$

At Cathode $: PbSO _{4(s)}+2 H _{2} O _{(l)} \rightarrow PbO _{2(s)}+ SO _{4(a q)}^{2-}+4 H ^{+}+2 e^{-}$