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99 Percentile Qs Bank for JEE MainChemistryd and f Block Elements

Copper sulphate is prepared by blowing a current of air through Cu scrap and dilute H 2 SO 4 . Dilute HNO 3 is also added

Options

  1. AWhich combines with H 2 SO 4 to give a very strong oxidising mixture and oxidises Cu to Cu 2+
  2. BTo oxidise Cu to Cu 2+ which then from CuSO 4 with dilute H 2 SO 4
  3. CTo increase ionisation of H 2 SO 4 to give SO 4 2 - ions
  4. DTo oxidise Fe 2+ to Fe 3+ sulphate, which remains in solution after crystallisation of CuSO 4

Correct answer

D. To oxidise Fe 2+ to Fe 3+ sulphate, which remains in solution after crystallisation of CuSO 4

Step-by-step solution

FeSO 4 → HNO 3 Dilute Fe 2 SO 4 3 ↓ + CuSO 4 Remains in solution Crystallises out

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