An electrochemical cell is constructed using half cells in the direction of spontaneous change $\mathrm{Fe}(\mathrm{OH})_{2}(\mathrm{~s})+2 \mathrm{e}^{-} \rightarrow \mathrm{Fe}(\mathrm{s})+2 \mathrm{OH}(\mathrm{aq}) \quad \mathrm{E}^{0}=-0.88 \mathrm{~V}$ and $\operatorname{AgBr}(\mathrm{s})+\mathrm{e}^{-} \rightarrow \operatorname{Ag}(\mathrm{s})+\operatorname{Br}^{-}(\mathrm{aq}) \mathrm{E}^{0}=+0.07 \mathrm{~V}$ Which of the following option is correct?

(A) Overall reaction $\mathrm{Fe}(\mathrm{s})+2 \mathrm{OH}^{-1}(\mathrm{aq})+2 \mathrm{AgBr}(\mathrm{s}) \rightleftharpoons \mathrm{Fe}(\mathrm{OH})_{2}(\mathrm{~s})+2 \mathrm{Ag}(\mathrm{s})+2 \mathrm{Br}^{-}(\mathrm{aq})$

(B) $\mathrm{E}_{\text{cell}}^{0}=-0.95 \mathrm{~V}$

(C) Fe is reduced in the electrochemical cell

(D) $\mathrm{E}_{\text{cell}}^{0}$ is an extensive property

JEE Main · 2026 · 02 Apr 2026 · Shift 1 · Redox Reactions and Electrochemistry

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An electrochemical cell is constructed using half cells in the direction of spontaneous change

Fe (OH)_{2} (s) + 2 e^{-} \to Fe (s) + 2 OH (aq) E^{0} = - 0.88 V

and

AgBr (s) + e^{-} \to Ag (s) + Br^{-} (aq) E^{0} = + 0.07 V

Which of the following option is correct?

(A)Overall reaction $Fe (s) + 2 OH^{- 1} (aq) + 2 AgBr (s) ⇌ Fe (OH)_{2} (s) + 2 Ag (s) + 2 Br^{-} (aq)$ ✓ Correct
(B) $E_{cell}^{0} = - 0.95 V$
(C)Fe is reduced in the electrochemical cell
(D) $E_{cell}^{0}$ is an extensive property

Answer: (A)

Solution

The half-cell with the higher reduction potential,

AgBr/Ag

+ 0.07 V

, acts as the cathode, while

Fe (OH)_{2} /Fe

- 0.88 V

is the anode where iron is oxidised. Combining the half-reactions, the spontaneous cell reaction is

Fe (s) + 2 O H^{-} (a q) + 2 AgBr (s) ⇌ Fe (OH)_{2} (s) + 2 Ag (s) + 2 B r^{-} (a q)

, with

E_{cell}^{0} = 0.07 - (- 0.88) = + 0.95 V

, a positive, intensive quantity. The correct description is this overall reaction.

JEE Main · 2026 · 02 Apr 2026 · Shift 1 · Single correct option

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JEE Main · 2026 · 02 Apr 2026 · Shift 1 · Redox Reactions and Electrochemistry

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