The number of hydrgen atom(s) attached to phosphours atom in hypophosphorus acid is :

Options

A. zero
B. two
C. one
D. three

Explanation

To determine the number of hydrogen atoms attached to the phosphorus atom in hypophosphorous acid (H₃PO₂), we can follow these steps:

### Step 1: Identify the chemical formula
The chemical formula for hypophosphorous acid is H₃PO₂. This indicates that the compound contains three hydrogen atoms, one phosphorus atom, and two oxygen atoms.

**Hint:** Look at the chemical formula to identify the number of hydrogen atoms present.

### Step 2: Draw the structure of hypophosphorous acid
To understand how the atoms are arranged, we can draw the structural formula. In hypophosphorous acid, phosphorus (P) is the central atom. It is bonded to one oxygen atom with a double bond and to another oxygen atom that is part of a hydroxyl group (OH).

**Hint:** Visualizing the structure helps in identifying how many hydrogen atoms are directly bonded to phosphorus.

### Step 3: Analyze the bonding
In the structure:
- Phosphorus is bonded to one oxygen atom with a double bond.
- Phosphorus is also bonded to one hydroxyl group (OH), which contributes one hydrogen atom.
- Additionally, there is one more hydrogen atom directly bonded to the phosphorus atom.

**Hint:** Count the hydrogen atoms that are directly attached to the phosphorus atom in the drawn structure.

### Step 4: Count the hydrogen atoms
From the structure:
- There is **one hydrogen atom** from the hydroxyl group (OH).
- There is **one additional hydrogen atom** directly bonded to phosphorus.

Thus, the total number of hydrogen atoms attached to the phosphorus atom is **2**.

**Hint:** Ensure to include all types of hydrogen atoms that are directly bonded to the central atom.

### Conclusion
The number of hydrogen atoms attached to the phosphorus atom in hypophosphorous acid (H₃PO₂) is **2**.

**Final Answer:** 2