Question

What is the colour of the product when ammonia reacts with a solution of \(Cu^{2+}\)?

• A. Orange
• B. Green
• C. Deep blue
• D. Yellow

Answer 1

The Correct Option is C

When ammonia (NH₃) reacts with a solution of copper(II) ions (Cu$_2^+$), it forms a complex ion, specifically [Cu(NH3)^₄]$_2^+$, which is characterized by a deep blue color. This deep blue solution is a result of the formation of the copper-ammonia complex.
The correct answer is Deep blue.

Answer 2

When ammonia (NH₃) reacts with a solution of copper(II) ions (Cu²⁺), it forms a complex ion, specifically [Cu(NH₃)₄]²⁺, which is characterized by a deep blue color. This deep blue solution is the result of the formation of the copper-ammonia complex, where the ammonia molecules coordinate with the copper ion, altering the electronic structure of the copper ion and leading to the distinct blue color.

The correct answer is Deep blue.