In the Daniell cell,$Zn|Zn^{2+} || Cu^{2+}|Cu$,when an external voltage is applied such that $E_{\text{external}} > E_{\text{cell}}$,current flows from.........

What is the electrical work done by a galvanic cell?

Which of the following is $NOT$ an example of a secondary voltaic cell?

Identify the gas produced due to reduction of $NH_4^{+}$ ions at cathode during working of dry cell.

The standard free energy change $(\Delta G^{\circ})$ for the following reaction (in $kJ$) at $25^{\circ} C$ is $3 Ca_{(s)} + 2 Au^{3+}(aq, 1 M) \rightarrow 3 Ca^{2+}(aq, 1 M) + 2 Au_{(s)}$ (given: $E^{\circ}_{Au^{3+}/Au} = +1.50 \ V, E^{\circ}_{Ca^{2+}/Ca} = -2.87 \ V, 1 \ F = 96500 \ C \ mol^{-1}$)

What is a galvanic cell? Give the half-cell reactions of a Daniell cell and explain a redox couple.