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JEE Main levelSingle correct optionDifficulty 2 of 3mt172

Which statement about the Parkes process is correct?

  1. AZinc is added to molten lead; silver dissolves preferentially in zinc, and the zinc-silver alloy is separated as a separate layer on top
  2. BZinc displaces silver from lead by forming with sulfur impurity
  3. CZinc is added to molten lead; silver is more soluble in lead, so it stays in the lead layer
  4. DThe zinc-silver alloy is denser than lead and sinks to the bottom of the pot

Answer: A

Silver is much more soluble in molten zinc than in lead, and zinc and lead are nearly immiscible. The zinc-silver alloy is lighter, floats and is skimmed off. Zinc is then distilled off to recover silver.
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