Ozone is tested by

Options

A. Ag
B. Hg
C. Zn
D. Au

Explanation

To test for the presence of ozone (O₃), we can use mercury (Hg) as a reagent. Here’s a step-by-step explanation of the process:

### Step 1: Understanding the Reaction
Ozone can be tested by its reaction with mercury. When ozone is introduced to mercury, a chemical reaction occurs.

### Step 2: The Reaction Equation
The reaction between ozone and mercury can be represented as:
\[ 2 \text{Hg} + \text{O}_3 \rightarrow \text{Hg}_2\text{O} + \text{O}_2 \]
In this reaction, mercury oxide (Hg₂O) and oxygen gas (O₂) are produced.

### Step 3: Observing the Changes
When ozone reacts with mercury, the mercury will change in appearance. The formation of mercury oxide indicates that the ozone is present.

### Step 4: Identifying the Result
The reaction leads to a "tarnishing" effect on the mercury, which is often referred to as the "tarnishing of mercury." This visual change is a clear indication that ozone is present.

### Step 5: Conclusion
Thus, the test for ozone involves observing the reaction of mercury, which results in the formation of mercury oxide and the observable change in the mercury's appearance.