Numbers of lone pairs present in ozone molecule is :-

Options

A. 4
B. 5
C. 6
D. 12

Answer

To determine the number of lone pairs present in an ozone molecule (O₃), we can follow these steps:

### Step 1: Understand the molecular formula
The molecular formula for ozone is O₃, which means it consists of three oxygen atoms.

**Hint:** Remember that the molecular formula gives you the number of atoms in the molecule.

### Step 2: Draw the Lewis structure
To find the lone pairs, we need to draw the Lewis structure of ozone. In ozone, one oxygen atom is bonded to another oxygen atom with a double bond, and the second oxygen is bonded to a third oxygen atom with a single bond.

**Hint:** The Lewis structure helps visualize how the atoms are connected and where the lone pairs are located.

### Step 3: Count the valence electrons
Each oxygen atom has 6 valence electrons. Therefore, for three oxygen atoms:
\[ 3 \times 6 = 18 \text{ valence electrons} \]

**Hint:** Valence electrons are the outermost electrons that participate in bonding.

### Step 4: Distribute the electrons
- The double bond between the first two oxygen atoms uses 4 electrons (2 pairs).
- The single bond between the second and third oxygen uses 2 electrons (1 pair).
- This totals to 6 electrons used for bonding.

Now, subtract the bonding electrons from the total valence electrons:
\[ 18 - 6 = 12 \text{ electrons remaining} \]

**Hint:** After accounting for bonding, the remaining electrons are used to form lone pairs.

### Step 5: Assign lone pairs to each oxygen atom
- The central oxygen atom (with the double bond) will have 1 lone pair (2 electrons).
- The oxygen atom with the single bond will have 3 lone pairs (6 electrons).
- The other oxygen atom (with the double bond) will also have 1 lone pair (2 electrons).

**Hint:** Each lone pair consists of 2 electrons.

### Step 6: Count the total lone pairs
Now, let's count the lone pairs:
- Central oxygen: 1 lone pair
- First oxygen: 3 lone pairs
- Second oxygen: 1 lone pair

Total lone pairs:
\[ 1 + 3 + 1 = 5 \text{ lone pairs} \]

**Hint:** Make sure to count all the lone pairs from each atom to get the total.

### Conclusion
The total number of lone pairs in an ozone molecule is 5.

**Final Answer:** The number of lone pairs present in the ozone molecule is 5.