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NEET levelSingle correct optionDifficulty 1 of 3qc118

When aqueous ammonia is added to a solution of $Cu X^{2 +}$ first dropwise and then in excess, the final observation is

Aa permanent pale blue precipitate
Ba white precipitate of $Cu (OH) X_{2}$
Ca deep blue solution of $[Cu (NH X_{3}) X_{4}] X^{2 +}$
Da deep red solution

Answer: C

A little ammonia gives a pale blue precipitate of the hydroxide (basic salt). Excess ammonia dissolves it:

Cu X^{2 +} + 4 NH X_{3} [Cu (NH X_{3}) X_{4}] X^{2 +}

, a deep blue solution.

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