An oxyacid of sulphur contained S = S linkage and the oxidation number of S in it is +6 and -2. It belongs to 

Options

A. `-` ous series
B. `-` ic series
C. peroxo series
D. thionic acid series

Answer

To solve the question regarding the oxyacid of sulfur that contains S=S linkage with oxidation states of +6 and -2, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Oxyacid**: We need to find an oxyacid of sulfur that has both +6 and -2 oxidation states for sulfur and contains a sulfur-sulfur (S=S) linkage.

2. **Understanding Oxidation States**:
- In the oxyacid, one sulfur atom (let's call it S1) has an oxidation state of +6. This typically indicates that this sulfur is bonded to multiple oxygen atoms.
- The other sulfur atom (let's call it S2) has an oxidation state of -2. This indicates that this sulfur is likely bonded to fewer electronegative atoms or is in a reduced state.

3. **Drawing the Structure**:
- For S1, which has an oxidation state of +6, it is bonded to three oxygen atoms (O) and has a double bond with another sulfur atom (S2). The structure can be represented as:
```
O
||
S1 -- S2
|
OH
```
- Here, S1 is double-bonded to one oxygen and single-bonded to two other oxygens (one of which is part of an OH group).
- For S2, which has an oxidation state of -2, it is bonded to S1 and possibly to hydrogen or other groups.

4. **Calculating Oxidation States**:
- For S1: If it is bonded to three oxygen atoms (each with an oxidation state of -2), the total contribution from oxygen is -6. Thus, to balance this, S1 must have an oxidation state of +6.
- For S2: It is bonded to S1 and has a -2 oxidation state due to its bonding nature (likely forming two bonds).

5. **Identifying the Type of Acid**:
- The presence of the S=S linkage and the specific oxidation states indicates that this oxyacid is part of the thionic acid series. However, since it has a +6 oxidation state, it aligns more closely with the sulfuric acid series, which is characterized by the suffix "-ic".

6. **Conclusion**: Based on the analysis, the oxyacid of sulfur with S=S linkage and oxidation states of +6 and -2 belongs to the **IC series**.

### Final Answer:
The oxyacid of sulfur with S=S linkage and oxidation states of +6 and -2 belongs to the **IC series**.

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