Embibe Experts Solutions for Chapter: Electrochemistry, Exercise 1: AP EAPCET 2021 (19-Aug Afternoon)

At $291 \mathrm{K}$, saturated solution of ${\mathrm{BaSO}}_4$ was found to have a specific conductivity of $3.648\times {10}^{-6}{\mathrm{ohm}}^{-1}{ \mathrm{cm}}^{-1}$ and that of water being used is $1.25\times {10}^{-6}{\mathrm{ohm}}^{-1}{ \mathrm{cm}}^{-1}$. If the ionic conductance's of ${\mathrm{Ba}}^{2+}$ and ${\mathrm{SO}}_4^{2-}$ are $110$ and $136.6{\mathrm{ohm}}^{-1}{ \mathrm{cm}}^2{ \mathrm{mol}}^{-1}$ respectively, the solubility of ${\mathrm{BaSO}}_4$ at $291 \mathrm{K}$ will be [Atomic masses of$\left.\mathrm{Ba}-137,S-32,0-16\right]$

${\mathrm{CuSO}}_4$ solution is electrolysed for $15$ minutes to deposit $0.4725 \mathrm{g}$ of copper at the cathode. The current in amperes required is $($Faraday $=96,500{\mathrm{Cmol}}^{-1}$, atomic weight of copper $=63)$

For the oxidation of $0.2 \mathrm{M} {\mathrm{FeSO}}_4$ solution $0.965$ amperes current is passed through it for $1$ hour. The volume of the solution that is oxidised in $\mathrm{mL}$ is

When a current of $10 \mathrm{A}$ is passes through molten ${\mathrm{AlCl}}_3$ for $1.608$ minutes. The mass of $\mathrm{Al}$ deposited will be [Atomic mass of $\mathrm{Al}=27 \mathrm{g}$]:-

Find the emf of the following cell reaction, given ${\mathrm{E}}_{{\mathrm{Cr}}^{3+}/{\mathrm{cr}}^{2+}}^0=-0.72 \mathrm{V}$ and ${\mathrm{E}}_{{\mathrm{Fe}}^{2+}/\mathrm{Fe}}{}^0=$$-0.42 \mathrm{V}$ at $25°\mathrm{C}$ is $\mathrm{Cr}\left|{\mathrm{Cr}}^{3+}(0.1\mathrm{M})\Vert {\mathrm{Fe}}^{2+}(0.1\mathrm{M})\right|\mathrm{Fe}$

For ${\mathrm{Cr}}_2{\mathrm{O}}_7^{2-}+14{\mathrm{H}}^{+}+6{\mathrm{e}}^{-\mathrm{yields}}⟶2{\mathrm{Cr}}^{3+}+7{\mathrm{H}}_2\mathrm{O},E^0=1.33 \mathrm{V}$ at $\left[{\mathrm{Cr}}_2{\mathrm{O}}_7^{2-}\right]=4.5$ millimole, $\left[{\mathrm{Cr}}^{3+}\right]=1.5$ millimole and $\mathrm{E}=1.067 \mathrm{V}$, then calculate the $\mathrm{pH}$ of the solution.

If hydrogen electrons dipped in two solutions of $\mathrm{pH}=3$ and $\mathrm{pH}=6$ are connected by a salt bridge, the emf of the resulting cell is

The molar conductivities $\left({\mathrm{\lambda }}_{\mathrm{m}}^0\right)$ at infinite dilution of $\mathrm{KBr}, \mathrm{HBr}$ and ${\mathrm{KNH}}_2$ are $120.5,420.6$ and $90.48 \mathrm{S}{ \mathrm{cm}}^2{ \mathrm{mol}}^{-1}$ respectively. Find the value of ${\mathrm{\lambda }}_{\mathrm{m}}^0$ for ${\mathrm{NH}}_3$.