MCQ
Ammonia forms the complex $[Cu(NH)_3)_4]^{2+}$ with copper ions in alkaline solution but not in acidic solution. the reason for this is
  • A
    In alkaline solution $Cu(OH)_2$ is precipitated which is soluble in excess of alkali
  • B
    Copper hydroxide is amphoteric substance
  • C
    In acidic solution hydration protects $Cu^{2+}$ ions
  • In acidic solution protons are coordinated with ammonia molecules forming $NH_4^+$ ions

Answer

Correct option: D.
In acidic solution protons are coordinated with ammonia molecules forming $NH_4^+$ ions
d
lone pair electrons of ammonia react with $H^+$ ione and convert in $NH_4^+$ ion which is not a ligand

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