Question

Match the column I with column II and mark the appropriate choice.

	Column I		Column II
(A)	$P{b}_{\left(s\right)}+S{O}_{4\left(aq\right)}^{-2}\to PbS{O}_{4\left(s\right)}+2e^{-}$	(i)	Rusting of iron
(B)	$2S{O}_{4\left(aq\right)}^{2-}\to S_2{O}_{8\left(aq\right)}^{2-}+2e^{-}$	(ii)	Reaction at anode in lead storage battery
(C)	$2H_{2\left(g\right)}+4O{H}_{\left(aq\right)}^{-}\to 4H_2{O}_{\left(l\right)}+4e^{-}$	(iii)	Electrolysis of concentrated $H_{2}S{O}_4$
(D)	$2F{e}_{\left(s\right)}+O_{2\left(g\right)}+4H_{\left(aq\right)}^{+}\to 2F{e}_{\left(aq\right)}^{2+}+2H_2{O}_{\left(l\right)}$	(iv)	Reaction at anode in fuel cell

• A. (A)$\to$ (i), (B)$\to$ (ii), (C)$\to$ (iii), (D)$\to$ (iv)
• B. (A)$\to$ (ii), (B)$\to$ (iii), (C)$\to$ (iv), (D)$\to$ (i)$
• C. (A)$\to$ (iii), (B)$\to$ (iv), (C)$\to$ (i), (D)$\to$ (ii)
• D. (A)$\to$ (iv), (B)$\to$ (i), (C)$\to$ (ii), (D)$\to$ (iii)

Answer 1

The correct option is B (A)$\to$ (ii), (B)$\to$ (iii), (C)$\to$ (iv), (D)$\to$ (i)$

Anode- Oxidation takes place

$Pb\left(s\right)+S{O}_4^{2-}\left(aq\right)⟶PbS{O}_4\left(s\right)+2e^{-}$

Fuel cell formation of $H_{2}O$ takes place from $H_2$ and $O_2$

$\therefore 2H_2+4O{H}^{⊝}⟶4H_{2}O+4e^{-}$

Electrolysis of concentrated $H_{2}S{O}_4-$

At anode oxidation takes place.

$2S{O}_4^{2-}⟶S_2{O}_8^{2-}+2e^{-}$

During rusting, $Fe⟶F{e}^{2+}$ state.