Give the number of weak filed ligand (s) from the following
`S^(2) , overset(Θ)(OH,CI^(Θ) ,H_(2) Θ , NO_(3) Θ ` ..

Explanation

To determine the number of weak field ligands from the given list, we will analyze each ligand based on the spectrochemical series. Here are the steps to solve the question:

### Step 1: Identify the Ligands
The ligands provided in the question are:
1. S²⁻
2. OH⁻
3. Cl⁻
4. H₂O
5. NO₃⁻

### Step 2: Understand the Concept of Weak Field Ligands
Weak field ligands are those that cause a small degree of crystal field splitting. This is important for determining the electronic configuration of the metal ion in coordination compounds.

### Step 3: Refer to the Spectrochemical Series
The spectrochemical series ranks ligands based on their field strength:
- Strong field ligands (high splitting): CN⁻, CO, NH₃, etc.
- Weak field ligands (low splitting): I⁻, Br⁻, Cl⁻, OH⁻, H₂O, NO₃⁻, etc.

### Step 4: Classify Each Ligand
Now, we will classify the provided ligands based on their position in the spectrochemical series:
- **S²⁻**: This is generally considered a strong field ligand.
- **OH⁻**: This is a weak field ligand.
- **Cl⁻**: This is a weak field ligand.
- **H₂O**: This is a weak field ligand.
- **NO₃⁻**: This is a weak field ligand.

### Step 5: Count the Weak Field Ligands
From the classification:
- Weak field ligands: OH⁻, Cl⁻, H₂O, NO₃⁻
- Total number of weak field ligands = 4

### Final Answer
The number of weak field ligands from the given list is **4**.

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