The Question is from neet-chemistry , and it was created by the author Mr. S M HUSSAIN

Question

Which ion is blue in colour in aqueous medium?

Mr. S M HUSSAIN · Accepted Answer

## CORE INFORMATION
✓ **Answer**: B
## CONCEPT FRAMEWORK
	**Primary Concept**: Color of Transition Metal Ions in Aqueous Solution
	**Related Topics**: Electronic Configuration, d-orbital splitting, Ligand Field Theory
	**Prerequisites**: Knowledge of transition metal properties, basic understanding of color in chemistry
## SOLUTION PATHWAY
**Given Information**:
	* Question asks for the ion which is blue in aqueous solution
**Method & Steps**:
	1. Recall the common colors of transition metal ions in aqueous solutions.
		Reasoning: Transition metal ions often exhibit characteristic colors due to electronic transitions within their d-orbitals.
	2. Identify that $Cu^{2+}$ ions are known to form blue colored complexes in aqueous solutions.
		Working: $Cu^{2+}$ forms a hexaquacopper(II) complex, $[Cu(H_2O)_6]^{2+}$, which absorbs light in the red region of the spectrum and transmits blue.
	3. Conclude that $Cu^{2+}$ is the correct answer.
		Result: $Cu^{2+}$ is the ion that is blue in aqueous solution.
 ## OPTION ANALYSIS
[A] :x: $Zn^{2+}$ is colorless in aqueous solution because it has a completely filled d-orbital.
[B] ✓: $Cu^{2+}$ is blue in aqueous solution due to its d9 electron configuration and d-d transitions.
[C] :x: $Sc^{3+}$ is colorless in aqueous solution because it has an empty d-orbital.
[D] :x: $Ti^{4+}$ is colorless in aqueous solution because it has an empty d-orbital.
 ## LEARNING AIDS
	**Common Mistakes**:
		1.[Error 1]: Confusing different transition metal colors. [How to avoid]: Memorize the common colors of common transition metal ions.
		2.[Error 2]: Assuming all transition metals are colored. [How to avoid]: Know that d0 and d10 configurations are usually colorless.
	**Quick Tips**:
		1.[Helpful shortcut]: Remember that Copper(II) compounds are often blue.
		2.[Memory aid]: Think of copper sulfate pentahydrate (blue vitriol) to recall the color of $Cu^{2+}$.

Mr. S M HUSSAIN · Answer

$Z{n^{2 + }}$

Mr. S M HUSSAIN · Answer

The correct Option is "$C{u^{2 + }}$"

Mr. S M HUSSAIN · Answer

$S{c^{3 + }}$

Mr. S M HUSSAIN · Answer

$T{i^{4 + }}$

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