Among `K,Ca,Fe` and `Zn` the element which can form more than one binary compound with chlorine is

Options

A. Fe
B. Zn
C. K
D. Ca

Explanation

To determine which element among potassium (K), calcium (Ca), iron (Fe), and zinc (Zn) can form more than one binary compound with chlorine (Cl), we need to analyze the oxidation states of each element and how they interact with chlorine.

### Step-by-Step Solution:

1. **Understanding Binary Compounds**:
- A binary compound consists of two distinct elements. In this case, we are looking at compounds formed with chlorine (Cl).

2. **Identifying Oxidation States**:
- Chlorine typically has an oxidation state of -1 when it forms compounds.
- Now let's look at the oxidation states of the given elements:
- Potassium (K): +1
- Calcium (Ca): +2
- Iron (Fe): +2 and +3
- Zinc (Zn): +2

3. **Forming Compounds with Chlorine**:
- Now, we can form binary compounds with chlorine for each element:
- **Potassium (K)**:
- KCl (K has +1, Cl has -1) → Forms only one compound.
- **Calcium (Ca)**:
- CaCl₂ (Ca has +2, Cl has -1) → Forms only one compound.
- **Iron (Fe)**:
- FeCl₂ (Fe has +2, Cl has -1)
- FeCl₃ (Fe has +3, Cl has -1) → Forms two compounds.
- **Zinc (Zn)**:
- ZnCl₂ (Zn has +2, Cl has -1) → Forms only one compound.

4. **Conclusion**:
- Among the elements K, Ca, Fe, and Zn, only iron (Fe) can form more than one binary compound with chlorine (FeCl₂ and FeCl₃).

### Final Answer:
The element which can form more than one binary compound with chlorine is **Iron (Fe)**.