Embibe Experts Solutions for Chapter: Electrochemistry, Exercise 2: Exercise 2

Electrode potential data are given below.

${\mathrm{Fe}}^{3+}\left(\mathrm{aqueous}\right)+{\mathrm{e}}^{-}⟶{\mathrm{Fe}}^{2+}\left(\mathrm{aq}\right); {\mathrm{E}}^{\circ }=+0.77$

${\mathrm{Al}}^{3+}\left(\mathrm{aqueous}\right)+3{\mathrm{e}}^{-}⟶\mathrm{Al}\left(\mathrm{s}\right); {\mathrm{E}}^{\circ }=-1.66 \mathrm{V}$

${\mathrm{Br}}_2\left(\mathrm{aqueous}\right)+2{\mathrm{e}}^{-}⟶2{\mathrm{Br}}^{-}\left(\mathrm{aqueous}\right); {\mathrm{E}}^{\circ }=+1.08 \mathrm{V}$

Based one the data given above, reducing power of ${\mathrm{Fe}}^{2+}, \mathrm{Al}$ and ${\mathrm{Br}}^{-}$ will increase in the order:

Given standard electrode potentials:

${\mathrm{Fe}}^{3+}+3{\mathrm{e}}^{-}⟶\mathrm{Fe}; \mathrm{E}°=-0.036 \mathrm{volt}$

${\mathrm{Fe}}^{2+}+2{\mathrm{e}}^{-}⟶\mathrm{Fe}; \mathrm{E}°=-0.440 \mathrm{volt}$

The standard electrode potential $\mathrm{E}°$ for ${\mathrm{Fe}}^{3+}+{\mathrm{e}}^{-}⟶{\mathrm{Fe}}^{2+}$.

$\mathrm{Pt}\left|\begin{array}{ll}{\mathrm{H}}_2& {\mathrm{H}}^{+}\\ \left({\mathrm{p}}_1\right)& \left(1 \mathrm{M}\right)\end{array}\Vert \begin{array}{l}{\mathrm{H}}^{+}\\ \left(1 \mathrm{M}\right)\end{array}\right|\overline{)\begin{array}{l}{\mathrm{H}}_2\\ \left({\mathrm{p}}_2\right)\end{array}}\mathrm{Pt}$ , (where ${\mathrm{p}}_1$ and ${\mathrm{p}}_2$ are pressures) cell reaction will be spontaneous if:

Three faradays of electricity was passed through an aqueous solution of iron $\left(\mathrm{II}\right)$ bromide. The mass of iron metal (at. mass $56$) deposited at the cathode is -

A current of $2 \mathrm{A}$ was passed for $1 \mathrm{h}$ through a solution of ${\mathrm{CuSO}}_4. 0.237 \mathrm{g}$ of ${\mathrm{Cu}}^{2+}$ ions were discharged at cathode. The current efficiency is:

Which has maximum conductivity:

Molar conductances of ${\mathrm{BaCl}}_2, {\mathrm{H}}_2{\mathrm{SO}}_4$ and $\mathrm{HCl}$ at infinite dilutions are ${\mathrm{x}}_1, {\mathrm{x}}_2$ and ${\mathrm{x}}_3$, respectively. Equivalent conductance of ${\mathrm{BaSO}}_4$ at infinite dilution will be:

Molten sodium chloride conducts electricity due to the presence of _____.