∴ Sulphide containing ores areAg,Cu,Pb.
Option A is correct.
A solution containing 1 mol per litre of each Cu(NO3)2,AgNO3, and Hg2(NO3)2 is being electrolyzed by using inert electrodes. The values of standard electrode potentials in volts (reduction potential) are Ag|Ag⨁=+0.80,2Hg|Hg2+2=+0.79 Cu|Cu2+=+0.34,Mg|Mg2+=−2.37 with increasing voltage, the sequence of deposition of metals at the cathode will be (IIT-JEE, 1984)