ElectrochemistryMedium
Question
A solution containing one mole per litre of each Cu(NO3)2, AgNO3, Hg2 (NO3)2 is being electrolysed by using inert electrodes. The values of standard electrode potentials in volts (reduction potential) are :
Ag+ | Ag = + 0.80, Hg22+ |2Hg = + 0.79
Cu2+ | Cu = + 0.34, Mg2+ | Mg = - 2.37
With increasing voltage, the sequence of deposition of metals on the cathode will be :
Ag+ | Ag = + 0.80, Hg22+ |2Hg = + 0.79
Cu2+ | Cu = + 0.34, Mg2+ | Mg = - 2.37
With increasing voltage, the sequence of deposition of metals on the cathode will be :
Options
A.Ag, Hg, Cu, Mg
B.Mg, Cu, Hg, Ag
C.Ag, Hg, Cu
D.Cu, Hg, Ag
Solution
A metal having highest EoR.P. will have highest tendency to remain as cation. On the basis of EoO.P. values given. The order of ions to remain in the solution is :
Ag+ < Hg22+ < Cu2+ < Mg2+
EoR.P. + 0.80 + 0.79 + 0.34 - 2.37
The reverse will be the order of deposition on the cathode during electrolysis. Thus the correct order of deposition will be :
Ag → Hg → Cu → Mg
Ag+ < Hg22+ < Cu2+ < Mg2+
EoR.P. + 0.80 + 0.79 + 0.34 - 2.37
The reverse will be the order of deposition on the cathode during electrolysis. Thus the correct order of deposition will be :
Ag → Hg → Cu → Mg
Create a free account to view solution
View Solution FreeMore Electrochemistry Questions
100 mL of buffer of 1 M NH3(aq) and 1 M NH4+(aq) are placed in two comparments of a voltaic cell separately. A current o...During the discharge of a lead storage battery, the density of sulphuric acid fell from 1.5 to 1.1 g/ml. Sulphuric acid ...Two litre solution of a bu er mixture containing 1.0 M – NaH2PO4 and 1.0 M – Na2HPO4 is placed in two compartments (one ...When the electric current is passed through a cell having an electrolyte, the positive ions move towards cathode and neg...Hyperconjugation is best described as :...