Embibe Experts Solutions for Chapter: Electrochemistry, Exercise 3: Exercise 3

Assertion: ${\mathrm{E}}_{\text{cell }}^0=0$ for a chloride ion concentration cell.

Reason: For this concentration cell where ${\mathrm{E}}_{\text{cell }}\frac{\mathrm{RT}}{\mathrm{nF}}=\ln \frac{{\left[{\mathrm{Cl}}^{-}\right]}_{\text{LHS }}}{\left[{\mathrm{Cl}}^{-}{\text{l }}_{\text{RHS }}\right.}$.

Assertion: When $2$ faraday of electricity is passed through $0.1{\mathrm{MH}}_2{\mathrm{SO}}_4\left(\mathrm{aq}\right)$, $11.2 \mathrm{litre} {\mathrm{O}}_2$ evolved at $\mathrm{STP}$.

Reason: Molecular weight of oxygen is $32$.

Assertion: Molar conductivity increases with decreases in concentration for weak electrolytes.

Reason: Number of ions per unit volume decreases due to dilution.

Assertion: According to Kohlrausch law the molar conductivity of an electrolyte at infinite dilution is the sum of molar conductivities of its ions.

Reason: At infinite dilution molar conductivity of an electrolyte is the least.

Assertion: Reactions of electrolytic cell are reversed or stopped if current supply in electrolytic cell is stopped.

Reason: $\mathrm{\Delta G}$ is positive for the reaction taking place in electrolytic cell.

Assertion: $1$ $\mathrm{coulomb}$ electricity deposits $1$ $\mathrm{g}$-equivalent of a substance.

Reason: $1$$\mathrm{faraday}$ is charge on $1$ $\mathrm{mole}$ of electricity.

Assertion: If $\mathrm{SRP}$of substance is $-0.5\mathrm{V}$ then reduction of substance is possible only in basic medium.

Reason: $\mathrm{SRP}$ of water is $-0.8274\mathrm{V}$ and at reduction potential is zero at $\mathrm{pH}=7$