Which of the following compound is not cooured?

Options

A. Copper (II) sulphat
B. Zinc(II) chloride
C. Chromium(II) sulphate
D. Manganese(II oxalate)

Explanation

To determine which of the given compounds is not colored, we need to analyze the electronic configurations of the metal ions in each compound. A compound is typically colored if it contains unpaired electrons in its d-orbitals. Let's evaluate the compounds step by step.

### Step 1: Analyze Copper Sulfate (CuSO₄)
- **Copper Ion (Cu²⁺)**: The electronic configuration of Cu is [Ar] 3d¹⁰ 4s¹. When it loses two electrons to form Cu²⁺, the configuration becomes [Ar] 3d⁹.
- **Unpaired Electrons**: Cu²⁺ has one unpaired electron in the 3d orbital (3d⁹).
- **Color**: Since it has unpaired electrons, CuSO₄ is colored.

### Step 2: Analyze Zinc Chloride (ZnCl₂)
- **Zinc Ion (Zn²⁺)**: The electronic configuration of Zn is [Ar] 3d¹⁰ 4s². When it loses two electrons to form Zn²⁺, the configuration becomes [Ar] 3d¹⁰.
- **Unpaired Electrons**: Zn²⁺ has no unpaired electrons (3d¹⁰).
- **Color**: Since it has no unpaired electrons, ZnCl₂ is not colored.

### Step 3: Analyze Chromium Sulfate (Cr₂(SO₄)₃)
- **Chromium Ion (Cr³⁺)**: The electronic configuration of Cr is [Ar] 3d⁵ 4s¹. When it loses three electrons to form Cr³⁺, the configuration becomes [Ar] 3d³.
- **Unpaired Electrons**: Cr³⁺ has three unpaired electrons in the 3d orbital (3d³).
- **Color**: Since it has unpaired electrons, Cr₂(SO₄)₃ is colored.

### Step 4: Analyze Manganese(II) Sulfate (MnSO₄)
- **Manganese Ion (Mn²⁺)**: The electronic configuration of Mn is [Ar] 3d⁵ 4s². When it loses two electrons to form Mn²⁺, the configuration becomes [Ar] 3d⁵.
- **Unpaired Electrons**: Mn²⁺ has five unpaired electrons in the 3d orbital (3d⁵).
- **Color**: Since it has unpaired electrons, MnSO₄ is colored.

### Conclusion
Among the compounds analyzed, **Zinc Chloride (ZnCl₂)** is the only compound that is not colored because it has a completely filled d-orbital with no unpaired electrons.

### Summary
- **Colored Compounds**: Copper Sulfate (CuSO₄), Chromium Sulfate (Cr₂(SO₄)₃), Manganese(II) Sulfate (MnSO₄).
- **Not Colored Compound**: Zinc Chloride (ZnCl₂).