In the electroplating of silver,`AgNO_(3)` solution is usually used as an electrolyte.Is this statement true??

When, during electrolysis of a solution of AgNO_(3) 9650 colombs of charge pass through the electroplating path, the mass of silver deposited on the cathode will be:

Bottles containing C_(6)H_(5)I and C_(6)H_(5)-CH_(2)I lost their original lables. They were labelled A and B for festing. A and B were separately taken in a test tube and boiled with NaOH solution. The end solution in each tube was made acidic with dilute HNO_(3) and then some AgNO_(3) solution was added. Substance B gave a yellow precipitate. Which one of the following statements is true for this experiment.