Efficiency of a cell with cell reaction under standard conditions,$A_{(s)} + B^{+} \to A^{+} + B_{(s)}$; $\Delta H^o = -300 \ kJ$ is $70\%$. The standard electrode potential of the cell is :- .................... $V$

Which of the following mixtures is used as an electrolyte paste in a mercury cell?

Consider a cell given below $Cu \,|\, Cu^{2+} \,|\, | \, Cl^{-} \,|\, Cl_2$,$Pt$. Write the reactions that occur at anode and cathode.

Using the standard electrode potentials given in Table $3.1$ of the $NCERT$ textbook,predict if the reaction between the following is feasible:
$(i)$ $Fe^{3+}_{(aq)}$ and $I^{-}_{(aq)}$
$(ii)$ $Ag^{+}_{(aq)}$ and $Cu_{(s)}$
$(iii)$ $Fe^{3+}_{(aq)}$ and $Br^{-}_{(aq)}$
$(iv)$ $Ag_{(s)}$ and $Fe^{3+}_{(aq)}$
$(v)$ $Br_{2(aq)}$ and $Fe^{2+}_{(aq)}$

Give the cell reaction and symbolic representation of the galvanic cell obtained by $E^o_{Ni^{2+}|Ni} = -0.23 \ V$ and $E^o_{Ag^{+}|Ag} = 0.80 \ V$.

Explain the symbolic representation of a galvanic cell (electrochemical cell) with a suitable example.