JEE Main · 2026 · 22 Jan 2026 · Shift 2 · Redox Reactions and Electrochemistry

The pH and conductance of a weak acid (HX) was found to be 5 and $4\times 10^{-5}\mathrm{S}$, respectively. The conductance was measured under standard condition using a cell where the electrode plates having a surface area of $1{\mathrm{cm}}^2$ were at a distance of 15 cm a …

Consider the following electrochemical cell at 298 K
$\mathrm{Pt}\left|{\mathrm{HSnO}}_2^{-}(\mathrm{aq})\right|\mathrm{Sn}(\mathrm{OH}{)}_6{}^{2-}(\mathrm{aq})\left|{\mathrm{Bi}}_2{\mathrm{O}}_3(\mathrm{s})\right|\mathrm{Bi}(\mathrm{s})$.
If the reaction quotient at a giv …

Aqueous HCl reacts with ${\mathrm{MnO}}_2(\mathrm{s})$ to form ${\mathrm{MnCl}}_2(\mathrm{aq})$, ${\mathrm{Cl}}_2(\mathrm{g})$ and ${\mathrm{H}}_2\mathrm{O}(l)$. What is the weight (in g) of ${\mathrm{Cl}}_2$ liberated when 8.7 g of ${\mathrm{MnO}}_2(\mathrm{s})$ is reacted w …

For a closed circuit Daniell cell, which of the following plots is the accurate one at a given temperature?

MX is a sparingly soluble salt that follows the given solubility equilibrium at 298 K
$\mathrm{MX}(\mathrm{s})\rightleftharpoons {\mathrm{M}}^{+}(\mathrm{aq})+{\mathrm{X}}^{-}(\mathrm{aq})$; ${\mathrm{K}}_{\mathrm{sp}}=10^{-10}$
If the standard reduction potential for …

Consider the following reduction processes:
${\mathrm{Al}}^{3+}+3{\mathrm{e}}^{-}\to \mathrm{Al}(\mathrm{s}),{\mathrm{E}}^{\circ }=-1.66\mathrm{V}$
${\mathrm{Fe}}^{3+}+{\mathrm{e}}^{-}\to {\mathrm{Fe}}^{2+},{\mathrm{E}}^{\circ }=+0.77\mathrm{V}$ …