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JEE Advanced levelSingle correct optionDifficulty 3 of 3mt053

of a zinc ore containing is roasted completely to (). The oxide is leached with dilute acid, , with of the oxide dissolving. Electrowinning then deposits of the dissolved zinc as metal. With , , , , the mass of consumed in leaching and the mass of zinc deposited are

  1. A117.60 kg and 66.69 kg
  2. B111.72 kg and 74.10 kg
  3. C111.72 kg and 66.69 kg
  4. D223.44 kg and 66.69 kg

Answer: C

Moles of ZnS , giving 1200 mol ZnO. Dissolved mol, so . Zinc deposited mol .
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