Ammonia forms the complex ion \[{{[Cu{{(N{{H}_{3}})}_{4}}]}^{2+}}\] with copper ions in alkaline solutions but not in acidic solution. What is the reason for it [AIEEE 2003]

In alkaline solutions insoluble \[Cu{{(OH)}_{2}}\] is precipitated which is soluble in excess of any alkali

In acidic solutions hydration protects copper ions

In acidic solutions protons coordinate with ammonia molecules forming \[NH_{4}^{+}\] ions and \[N{{H}_{3}}\]molecules are not available

Copper hydroxide is an amphoteric substance

Ammonia forms the complex ion \[{{[Cu{{(N{{H}_{3}})}_{4}}]}^{2+}}\] wi

1.	Ammonia forms the complex ion \[{{[Cu{{(N{{H}_{3}})}_{4}}]}^{2+}}\] with copper ions in alkaline solutions but not in acidic solution. What is the reason for it [AIEEE 2003]
A.	In acidic solutions hydration protects copper ions
B.	In acidic solutions protons coordinate with ammonia molecules forming \[NH_{4}^{+}\] ions and \[N{{H}_{3}}\]molecules are not available
C.	In alkaline solutions insoluble \[Cu{{(OH)}_{2}}\] is precipitated which is soluble in excess of any alkali
D.	Copper hydroxide is an amphoteric substance
Answer» C. In alkaline solutions insoluble \[Cu{{(OH)}_{2}}\] is precipitated which is soluble in excess of any alkali

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Ammonia forms the complex ion \[{{[Cu{{(N{{H}_{3}})}_{4}}]}^{2+}}\] with copper ions in alkaline solutions but not in acidic solution. What is the reason for it [AIEEE 2003]

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