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JEE Main levelSingle correct optionDifficulty 2 of 3qc032

The yellow sulphide of arsenic is oxidised with concentrated and the solution is warmed with ammonium molybdate in nitric acid. The observation and the oxidation state of arsenic in the reacting species are

  1. Awhite precipitate;
  2. Bcanary yellow precipitate; (arsenite)
  3. Cblue colour;
  4. Dcanary yellow precipitate; (arsenate)

Answer: D

Concentrated nitric acid oxidises sulphidic arsenic to arsenic acid, (arsenic ). Arsenate with ammonium molybdate in hot nitric acid gives a canary yellow precipitate of ammonium arsenomolybdate.
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