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Ammonia forms the complex ion [ Cu ( NH ₃ )₄ ]²⁺ with copper ions in alkaline solutions but not in acidic solutions. What is the reason for it?

Options

  1. AIn acidic solutions protons coordinate with ammonia molecules forming NH ₄⁺ ions and NH ₃ molecules are not av
  2. BIn alkaline solutions insoluble Cu ( OH )₂ is precipitated which is soluble in excess of any alkali
  3. CCopper hydroxide is an amphoteric substance
  4. DIn acidic solutions hydration protects copper ions.

Correct answer

A. In acidic solutions protons coordinate with ammonia molecules forming NH ₄⁺ ions and NH ₃ molecules are not av

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