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JEE Main levelSingle correct optionDifficulty 2 of 3pb026

A little aqueous ammonia is added to a solution of potash alum, and then more ammonia is added in excess. What is observed?

  1. ANo precipitate forms at any stage
  2. BA white precipitate forms which dissolves in excess ammonia
  3. CA blue precipitate forms
  4. DA white gelatinous precipitate forms which does not dissolve in excess ammonia

Answer: D

gives white gelatinous . Aluminium hydroxide is amphoteric but is not dissolved by the weak base ammonia, unlike which forms an ammine complex.
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