Which one is correctly matched `:`

Options

A. `{:("Substance","O.N. of S"),(H_(2)S,+2):}`
B. `{:("Substance","O.N. of S"),(H_(2)SO_(5),+4):}`
C. `{:("Substance","O.N. of S"),(H_(2)SO_(4) , +4):}`
D. `{:("Substance","O.N. of S"),(Na_(2)S_(4)O_(6),+2.5):}`

Answer

To solve the question regarding the correct matching of oxidation numbers for the given substances, we will analyze each option step by step.

### Step 1: Analyze H2S
1. **Identify oxidation states**:
- Hydrogen (H) typically has an oxidation state of +1.
- Let the oxidation state of Sulfur (S) be \( x \).

2. **Set up the equation**:
- The compound is neutral, so the sum of oxidation states must equal 0:
\[ 2(+1) + x = 0 \]
\[ 2 + x = 0 \implies x = -2 \]

3. **Conclusion**:
- The oxidation state of Sulfur in H2S is -2. If the option states otherwise, it is incorrect.

### Step 2: Analyze H2SO5
1. **Identify oxidation states**:
- Hydrogen (H) = +1
- Oxygen (O) typically = -2, but in peroxides, it can be -1.
- Let the oxidation state of Sulfur (S) be \( x \).

2. **Set up the equation**:
- There are 2 O atoms in peroxide (-1 each) and 3 O atoms in the usual state (-2 each):
\[ 2(+1) + x + 3(-2) + 2(-1) = 0 \]
\[ 2 + x - 6 - 2 = 0 \implies x - 6 = 0 \implies x = +6 \]

3. **Conclusion**:
- The oxidation state of Sulfur in H2SO5 is +6. If the option states otherwise, it is incorrect.

### Step 3: Analyze H2SO4
1. **Identify oxidation states**:
- Hydrogen (H) = +1
- Oxygen (O) = -2
- Let the oxidation state of Sulfur (S) be \( x \).

2. **Set up the equation**:
\[ 2(+1) + x + 4(-2) = 0 \]
\[ 2 + x - 8 = 0 \implies x - 6 = 0 \implies x = +6 \]

3. **Conclusion**:
- The oxidation state of Sulfur in H2SO4 is +6. If the option states otherwise, it is incorrect.

### Step 4: Analyze Na2S4O6
1. **Identify oxidation states**:
- Sodium (Na) = +1
- Oxygen (O) = -2
- Let the oxidation state of Sulfur (S) be \( x \).

2. **Set up the equation**:
\[ 2(+1) + 4x + 6(-2) = 0 \]
\[ 2 + 4x - 12 = 0 \implies 4x - 10 = 0 \implies 4x = 10 \implies x = 2.5 \]

3. **Conclusion**:
- The oxidation state of Sulfur in Na2S4O6 is +2.5. If the option states this, it is correct.

### Final Answer
The correctly matched oxidation number is for **Na2S4O6**, where the oxidation state of Sulfur is +2.5.