Which of the following pairs of name and formula of complexes is correct ?

Options

A. Tetramminecopper(II) sulphate………..`[Cu(NH_(3))_(4)]SO_(4)`
B. Diamminesilver(I) chloride …………..`[Ag(NH_(3))_(2)]Cl`
C. Potassium hexayanidoferrate(III)……….`K_(4)[Fe(CN)_(6)]`
D. Potassium amminepentachloridoplatinate(IV)……………`K[Pt(NH_(3))Cl_(5)]`

Explanation

To determine which pairs of names and formulas of complexes are correct, we can analyze each option step by step.

### Step-by-Step Solution:

1. **First Complex: Tetraamine Copper(II) Sulfate**
- **Name:** Tetraamine Copper(II) Sulfate
- **Ligands:** 4 NH3 (neutral ligands)
- **Counter Ion:** SO4^2- (sulfate with a charge of -2)
- **Oxidation State Calculation:**
- Let the oxidation state of copper be \( X \).
- The equation is: \( X + 0 + (-2) = 0 \)
- Solving gives \( X = +2 \).
- **Formula:** [Cu(NH3)4]SO4
- **Conclusion:** The name and formula are correct.

2. **Second Complex: Diamine Silver Chloride**
- **Name:** Diamine Silver Chloride
- **Ligands:** 2 NH3 (neutral ligands)
- **Counter Ion:** Cl^- (chloride with a charge of -1)
- **Oxidation State Calculation:**
- Let the oxidation state of silver be \( X \).
- The equation is: \( X + 0 + (-1) = 0 \)
- Solving gives \( X = +1 \).
- **Formula:** [Ag(NH3)2]Cl
- **Conclusion:** The name and formula are correct.

3. **Third Complex: Potassium Hexacyanidoferrate(III)**
- **Name:** Potassium Hexacyanidoferrate(III)
- **Ligands:** 6 CN^- (cyanide ligands)
- **Counter Ion:** K^+ (potassium)
- **Oxidation State Calculation:**
- Let the oxidation state of iron be \( X \).
- The equation is: \( 3(+1) + X + 6(-1) = 0 \)
- Solving gives \( X = +3 \).
- **Formula:** K3[Fe(CN)6]
- **Conclusion:** The name is correct, but the formula K4[Fe(CN)6] is incorrect as there should be 3 potassium ions.

4. **Fourth Complex: Potassium Amine Pentachloridoplatinate(IV)**
- **Name:** Potassium Amine Pentachloridoplatinate(IV)
- **Ligands:** 5 Cl^- (chloride ligands) and 1 NH3 (neutral ligand)
- **Counter Ion:** K^+ (potassium)
- **Oxidation State Calculation:**
- Let the oxidation state of platinum be \( X \).
- The equation is: \( (+1) + X + 5(-1) = 0 \)
- Solving gives \( X = +4 \).
- **Formula:** K[Pt(NH3)Cl5]
- **Conclusion:** The name and formula are correct.

### Final Conclusion:
The complexes with correct names and formulas are:
- First Complex: Correct
- Second Complex: Correct
- Third Complex: Incorrect (due to formula)
- Fourth Complex: Correct

### Summary of Correct Options:
The correct pairs of name and formula of complexes are options 1, 2, and 4.