`H_(4)underline(P_(2))O_()+H_(2)O to H_(3)PO_(3)`

Options

A. If product is oxy acid with -ic suffix.
B. If product is oxy acid with -ous suffix
C. If product are two oxy acids one with -ic suffix and otherone with -ous suffix.
D. If product is not oxy acid, neither with -ic suffix nor with -ous suffix

Answer

To solve the question regarding the reaction \( H_4P_2O + H_2O \rightarrow H_3PO_3 \), we will analyze the reaction step by step to determine the nature of the product formed and identify which option best describes it.

### Step 1: Identify the Reactants
The reactants in the equation are:
- \( H_4P_2O \) (which is diphosphoric acid)
- \( H_2O \) (water)

### Step 2: Analyze the Reaction
When \( H_4P_2O \) reacts with water, it typically undergoes hydrolysis. Hydrolysis is a reaction involving the breaking of bonds in the presence of water.

### Step 3: Determine the Product
The product of this reaction is \( H_3PO_3 \), which is known as phosphorous acid.

### Step 4: Check the Structure of the Product
To confirm that \( H_3PO_3 \) is an oxyacid, we need to analyze its structure:
- The formula \( H_3PO_3 \) can be represented as \( H_1PO_3H_2 \), indicating that it contains hydrogen, phosphorus, and oxygen.
- The structure consists of one phosphorus atom bonded to three oxygen atoms, with one of the oxygen atoms being part of a hydroxyl group (–OH).

### Step 5: Verify Oxyacid Criteria
For a compound to be classified as an oxyacid, it must meet the following criteria:
1. It must contain hydrogen (H), oxygen (O), and at least one other element (in this case, phosphorus (P)).
2. It must have at least one hydrogen atom that is bonded to an oxygen atom and can dissociate to form \( H^+ \) ions.

In \( H_3PO_3 \):
- It contains H, O, and P.
- It has a hydroxyl group (–OH) that can dissociate to release \( H^+ \).

### Step 6: Identify the Suffix
The suffix of the oxyacid is determined by the oxidation state of the central atom (phosphorus in this case). Since phosphorous acid (\( H_3PO_3 \)) has phosphorus in a lower oxidation state compared to phosphoric acid (\( H_3PO_4 \)), it is classified with the suffix "OUS".

### Conclusion
Based on the analysis, the product \( H_3PO_3 \) is indeed an oxyacid with the suffix "OUS". Therefore, the correct option is:

**Option B: The product is an oxyacid with OUS suffix.**