Home Chemistry Enviromental Chemistry ( Not In Syllabus ) Practical Chemistry 1 mL of concentrated aqueous ammonia is adde…
Chemistry Enviromental Chemistry ( Not In Syllabus ) Practical Chemistry Single Correct MCQ
Published on: August 14, 2026

1 mL of concentrated aqueous ammonia is added dropwise to 1 mL of a dilute aqueous solution of Cu(II). What observations can be made during this process ?

A
The colorless Cu(II) nitrate solution turns blue and yields a dark blue precipitate
B
The colorless copper (II) nitrate solution yields a white precipitate which turns dark blue upon standing.
C
The light blue copper (II) nitrate solution yields a white precipitate which redissolves to form a dark blue solution.
D
The light blue copper (II) nitrate solution turns dark

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Text Solution

Verified by Experts
The correct answer is:
C

Cu (NO 3 ) 2 (blue) + NH 4 OH → Cu(OH) 2 ↓ (blue) + 2NH 4 +

Cu (OH) 2 + NH 4 OH → [Cu(NH 3 ) 4 ] 2+ (dark blue)

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