Electrochemistry

Calculate emf of the following cell at $25^{\circ} \mathrm{C}$ if value of $E_{\text {cell }}^{\circ}$ is $4 \mathrm{~V}$ (Given $R T / F \ln 10=0.06$) : $M\left|M_{(0.01 \mathrm{M})}^{2+}\right|\left|M_{(0.0001…

Assertion : Electrolysis of $\mathrm{NaCl}_{(a q)}$ produces $\mathrm{Na}$ metal. Reason : $\mathrm{Na}^{+}$is obtained at cathode.

Assertion : Molar conductivity of a weak electrolyte at infinite dilution cannot be determined experimentally. Reason : Kohlrausch law helps to find the molar conductivity of a weak electrolyte at infinite dilution.

$0.1 \mathrm{M}$ solution is present in a conductivity cell with electrode of $100 \mathrm{~cm}^2$ area placed $1 \mathrm{~cm}$ apart and resistance observed is $5 \times 10^3 \mathrm{ohm}$. What is the molar…

Assertion : Reverse current flows in charging of lead storage battery. Reason : During charging, $\mathrm{PbSO}_4$ converts into $\mathrm{Pb}$ and $\mathrm{PbO}_2$.

Time taken to completely decompose $36 \mathrm{~g}$ of water by passing $3 \mathrm{~A}$ current is

Cell equation : $A+2 B^{+} \longrightarrow A^{2+}+2 B$ $A^{2+}+2 e^{-} \longrightarrow A ; E^{\circ}=+0.34 \mathrm{~V}$ and $\log _{10} K=15.6$ at $300 \mathrm{~K}$ for cell reactions. Find $E^{\circ}$ for $B^{+}+e^{-}…

Assertion : If standard reduction potential for the reaction $\mathrm{Ag}^{+}+e^{-} \rightarrow \mathrm{Ag}$ is 0.80 volt, then for the reaction $2 \mathrm{Ag}^{+}+2 e^{-} \rightarrow 2 \mathrm{Ag}$, it will be 1.60…

On the basis of standard electrode potential of redox couples given below, find out which of the following is the strongest oxidising agent. $\left(E^{\circ}\right.$ values $:…

Assertion : In electrolysis, the quantity of electricity needed for depositing 1 mole of silver is different from that required for 1 mole of copper. Reason : The molecular weights of silver and copper are different.

A conductivity cell has a cell constant of $0.5 \mathrm{~cm}^{-1}$. This cell when filled with $0.01 \mathrm{M}$ $\mathrm{NaCl}$ solution has a resistance of $384 \mathrm{ohms}$ at $25^{\circ} \mathrm{C}$. Calculate the…

How many Faradays of electricity are required for the given reaction to occur? $\mathrm{MnO}_4^{-} \longrightarrow \mathrm{Mn}^{2+}$