Preferential discharge of silver ions at the cathode Steps:

• Identify cations in solution: Cu²⁺ from Cu(NO₃)₂ and Ag⁺ from AgNO₃.
• Recall that in electrolysis, at the cathode (negative electrode), the cation easier to reduce (higher standard electrode potential) is discharged first.
• Compare potentials: Ag⁺/Ag (+0.80 V) > Cu²⁺/Cu (+0.34 V), so Ag⁺ is reduced to Ag metal initially.
• Copper being above silver in reactivity series confirms Ag⁺ discharges preferentially, as less reactive metals form at cathode first.
• Deposition occurs only at cathode; anode produces O₂ from NO₃⁻ or H₂O.

Why no single option is fully correct:

• Without diagram, cannot identify if cathode is X or Y, so ambiguous between B and C.

Not enough information. Final answer: Not enough information.