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Question: Answered & Verified by Expert
Ammonia forms the complex ion $\left[\mathrm{Cu}\left(\mathrm{NH}_3\right)_4\right]^{2+}$ with copper ions in alkaline solutions but not in acidic solutions. What is the reason for it?
ChemistryCoordination CompoundsJEE MainJEE Main 2003
Options:
  • A
    In acidic solutions protons coordinate with ammonia molecules forming $\mathrm{NH}_4^{+}$ions and $\mathrm{NH}_3$ molecules are not available
  • B
    In alkaline solutions insoluble $\mathrm{Cu}(\mathrm{OH})_2$ is precipitated which is soluble in excess of any alkali
  • C
    Copper hydroxide is an amphoteric substance
  • D
    In acidic solutions hydration protects copper ions.
Solution:
1455 Upvotes Verified Answer
The correct answer is:
In acidic solutions protons coordinate with ammonia molecules forming $\mathrm{NH}_4^{+}$ions and $\mathrm{NH}_3$ molecules are not available
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