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JEE Main levelSingle correct optionDifficulty 2 of 3qa066

In the yellow precipitate , the oxidation states of P and Mo respectively are

  1. A and
  2. B and
  3. C and
  4. D and

Answer: B

The unit carries charge ( gives ). With four such units the anion charge is , so P is . The ammonium ions supply . Thus P is and Mo is .
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