1.

An aqueous solution containing one mole per litre of each Cu(NO_(3))_(2),AgNO_(3),Hg_(2)(NO_(3))_(2) and Mg(NO_(3))_(2) is being electrolysed using inert electrodes. The values of the standard electrode potentials in volts (reduction potentials) are Ag|Ag^(+)=0.80,2Hg|Hg_(2)^(2+)=+0.79 Cu|Cu^(2+)=+0.34,Mg|Mg^(2+)=-2.37 With increasing voltage, the sequence of deposition of metals on cathode will be

Answer»

AG,HG,Cu,Mg
Mg,Cu,Hg,Ag
Ag,Hg,Cu
Cu,Hg,Ag

Solution :HIGHER the reduction potential, more EASILY is the metal deposited `(M^(n+)+n e^(-)toM)`. `Mg^(2+)` ions will not be deposited because `H_(2)O` is reduced more easily than `Mg^(2+)` ions.


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