Ozone is obtained by silent electric discharge on oxygen.

Answer

To determine whether the statement "Ozone is obtained by silent electric discharge on oxygen" is true or false, we can follow these steps:

### Step 1: Understand the Process
- Silent electric discharge is a method used to convert oxygen gas (O₂) into ozone (O₃). This process involves applying a high voltage to oxygen, which causes the oxygen molecules to dissociate and recombine to form ozone.

**Hint:** Recall the basic chemical reactions involving oxygen and ozone.

### Step 2: Write the Reaction
- The chemical reaction can be represented as follows:
\[ 3O_2 \rightarrow 2O_3 \]
- This indicates that three molecules of oxygen gas yield two molecules of ozone.

**Hint:** Consider the stoichiometry of the reaction when writing it down.

### Step 3: Identify the Characteristics of Ozone
- Ozone is a triatomic molecule consisting of three oxygen atoms. It is known for its distinct properties and is often referred to as "ozonized oxygen" when produced through this method.

**Hint:** Think about the properties and uses of ozone in the atmosphere.

### Step 4: Analyze the Yield of Ozone
- When ozone is produced through silent electric discharge, typically only about 10% of the mixture consists of ozone, with the rest being unreacted oxygen.

**Hint:** Reflect on the efficiency of chemical reactions and the concept of yield.

### Step 5: Consider the Energy Change
- The formation of ozone from oxygen is an endothermic reaction, meaning it absorbs energy. The enthalpy change (ΔH) for this reaction is positive (+284.5 kJ).

**Hint:** Remember the significance of enthalpy changes in chemical reactions.

### Step 6: Conclusion
- Since ozone is indeed produced when oxygen undergoes silent electric discharge, we conclude that the statement is true.

**Final Answer:** The statement "Ozone is obtained by silent electric discharge on oxygen" is **True**.

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