Concept:The anode in the electrolysis of brine is chosen to resist the corrosive chlorine gas produced during the process.
Explanation:Brine is a concentrated solution of
NaCl.
During electrolysis, chloride ions are oxidised at the anode to form chlorine gas.
Carbon (graphite) is normally used because it conducts electricity well and is not easily attacked by chlorine.
In the industrial mercury cell, the cathode is mercury, but the anode is carbon.
Platinum, copper, and zinc are unsuitable: platinum is costly, while copper and zinc would react with the electrolyte or chlorine.
Answer:D. carbon