The normality of 30 volume `H_2 O_2` is

Explanation

To determine the normality of 30 volume H₂O₂, we can follow these steps:

### Step 1: Understand the Concept of Volume Strength
The term "30 volume" means that 1 liter of H₂O₂ can release 30 liters of O₂ gas at standard temperature and pressure (STP).

### Step 2: Calculate the Amount of O₂ Produced
From the definition of volume strength, 30 volume H₂O₂ produces 30 liters of O₂. According to the reaction:
\[ 2 \text{H}_2\text{O}_2 \rightarrow 2 \text{H}_2\text{O} + \text{O}_2 \]
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