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Q.

Ammonia forms the complex CuNH342+ with copper ions in alkaline solution but not in acid solution. The reason for it is:

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a

in alkaline solution Cu(OH)2 is precipitated which is soluble in excess of alkali

b

in acidic solution protons coordinates with ammonia molecule forming NH4+ ions and NH3 molecules are not available.

c

copper hydroxide is amphoteric

d

in acidic solution hydration protects Cu2+ ions

answer is B.

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It is a reason for given fact.
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