Which of the following will give maximum type of cations in water?

Options

A. `KCI.MgCl_(2).6H_(2)O`
B. `K_(4)[Fe(CN)_(8)]`
C. `K_(3)[Fe(CN)_(6)]`
D. `[Ag(CN)_(2)]^(-)`

Answer

To solve the question of which compound will give the maximum type of cations in water, we will analyze each option provided in the question. Here’s a step-by-step breakdown of the solution:

### Step 1: Understand the Definition of Cations
Cations are positively charged ions. They can be single atoms or groups of atoms that carry a positive charge. For example, K⁺ (potassium ion) and NH₄⁺ (ammonium ion) are both cations.

### Step 2: Analyze the Given Compounds
We need to evaluate the dissociation of each compound in water to determine how many different types of cations they produce.

1. **KCl·MgCl₂·6H₂O (Double Salt)**
- When this double salt dissolves in water, it dissociates into:
- K⁺ (potassium ion)
- Mg²⁺ (magnesium ion)
- Cl⁻ ions (which are not cations)
- The types of cations produced here are K⁺ and Mg²⁺.
- **Total types of cations = 2**

2. **K₄[Fe(CN)₆] (Coordination Complex)**
- This compound contains a coordination sphere, which does not dissociate in water.
- The potassium ions will dissociate, producing:
- K⁺ (4 potassium ions)
- However, since all potassium ions are the same type, we only count one type of cation.
- **Total types of cations = 1**

3. **K₃[Fe(CN)₆] (Coordination Complex)**
- Similar to the previous compound, the coordination complex does not dissociate.
- Potassium ions will dissociate, producing:
- K⁺ (3 potassium ions)
- Again, this counts as only one type of cation.
- **Total types of cations = 1**

4. **Ag₂[CN]₂ (Coordination Complex)**
- This compound also contains a coordination sphere and will not dissociate.
- The silver ions will dissociate, producing:
- Ag⁺ (2 silver ions)
- However, since both are the same type, we count it as one type of cation.
- **Total types of cations = 1**

### Step 3: Compare the Results
Now, we compare the total types of cations produced by each compound:
- KCl·MgCl₂·6H₂O: 2 types of cations (K⁺, Mg²⁺)
- K₄[Fe(CN)₆]: 1 type of cation (K⁺)
- K₃[Fe(CN)₆]: 1 type of cation (K⁺)
- Ag₂[CN]₂: 1 type of cation (Ag⁺)

### Conclusion
The compound that gives the maximum type of cations in water is **KCl·MgCl₂·6H₂O**, which produces **2 types of cations**.

### Final Answer
**Option A: KCl·MgCl₂·6H₂O will give the maximum type of cations in water.**

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