An aqueous solution containing 1 M each of Au 3+ , Cu 2+ , Ag + , Li + is being…
Chemistry · JEE Main · NTA Exams — Redox Reactions and Electrochemistry
An aqueous solution containing 1 M each of Au3+, Cu2+, Ag+, Li+ is being electrolysed by using inert electrodes. The value of standard potentials are :
\(\mathrm{E}_{\mathrm{Ag}^{+} / \mathrm{Ag}}^{\circ}\) = 0.80 V, \(\mathrm{E}^{\circ}{ }_{\mathrm{Cu}^{2+} / \mathrm{Cu}}\) = 0.34 V and \(\mathrm{E}^{\circ}{ }_{\mathrm{Au}^{3+} / \mathrm{Au}}\)= 1.50 V, \(\mathrm{E}^{\circ}{ }_{\mathrm{Li}^{+} / \mathrm{Li}}\) = – 3.03 V
with increasing voltage, the sequence of deposition of metals on the cathode will be :
\(\mathrm{E}_{\mathrm{Ag}^{+} / \mathrm{Ag}}^{\circ}\) = 0.80 V, \(\mathrm{E}^{\circ}{ }_{\mathrm{Cu}^{2+} / \mathrm{Cu}}\) = 0.34 V and \(\mathrm{E}^{\circ}{ }_{\mathrm{Au}^{3+} / \mathrm{Au}}\)= 1.50 V, \(\mathrm{E}^{\circ}{ }_{\mathrm{Li}^{+} / \mathrm{Li}}\) = – 3.03 V
with increasing voltage, the sequence of deposition of metals on the cathode will be :
- Li, Cu, Ag, Au
- Cu, Ag, Au
- Au, Ag, Cu
- Au, Ag, Cu, Li
Answer
(C) Au, Ag, Cu
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