Identify the incorrect statement with respect to ozone.

Options

A. It is formed when dry stream of `O_2` is passed through a silent electrical discharge
B. It acts as a powrful oxidizing agent
C. It's decomposition into oxygen reults in an increase in entropy
D. Ozone protects the earth's inhabitants by absorbing gamma radiations

Answer

To solve the question of identifying the incorrect statement with respect to ozone, we will analyze each of the four provided statements one by one.

### Step 1: Analyze Statement 1
**Statement 1:** "It is found when a dry stream of O2 is passed through a silent electrical discharge."

- **Analysis:** Ozone (O3) is indeed produced when a dry stream of oxygen (O2) is subjected to silent electrical discharge. This process involves the conversion of O2 into O3 due to the energy provided by the electrical discharge.
- **Conclusion:** This statement is **correct**.

### Step 2: Analyze Statement 2
**Statement 2:** "It acts as a powerful oxidizing agent."

- **Analysis:** Ozone is known to be a powerful oxidizing agent. When it decomposes, it produces nascent oxygen, which is highly reactive and can oxidize various substances. For example, it can oxidize potassium iodide to iodine.
- **Conclusion:** This statement is **correct**.

### Step 3: Analyze Statement 3
**Statement 3:** "Decomposition into oxygen results in an increase in entropy."

- **Analysis:** The decomposition of ozone (O3) into diatomic oxygen (O2) does indeed lead to an increase in entropy. This is because the reaction produces more molecules (from 3 O atoms in ozone to 2 O atoms in O2), and the formation of a more stable molecule (O2) is favored. The process is spontaneous, leading to a positive change in entropy (ΔS).
- **Conclusion:** This statement is **correct**.

### Step 4: Analyze Statement 4
**Statement 4:** "Ozone protects Earth's inhabitants by absorbing gamma radiation."

- **Analysis:** This statement is **incorrect**. Ozone primarily protects the Earth from ultraviolet (UV) radiation, not gamma radiation. Gamma radiation is much more penetrating and is not absorbed by ozone in the atmosphere.
- **Conclusion:** This statement is **incorrect**.

### Final Conclusion
After analyzing all four statements, we find that the incorrect statement with respect to ozone is **Statement 4**, which claims that ozone protects against gamma radiation. In reality, ozone protects against ultraviolet radiation.

### Summary of the Incorrect Statement
- **Incorrect Statement:** Ozone protects Earth's inhabitants by absorbing gamma radiation.