Hydrogen peroxide `(H_2 O_2)` was first prepared by Thenard by acidifying barium peroxide and removal of excess water by evaporation under reduced pressure. Its strength can be expressed as weigth percentage or as volume percentage . 25% solution by weight means 25 g of hydrogen peroxide are present in 100 g of solution and 25 volume of hydrogen peroxide means that 1 litre of this solution will give 25 L of oxygen at NTP.
Can we use anhydrous barium peroxide for the preparation of `H_2 O_2` ?

Explanation

To determine whether we can use anhydrous barium peroxide for the preparation of hydrogen peroxide (H₂O₂), we need to analyze the chemical reaction involved and the properties of the reactants.

### Step-by-Step Solution:

1. **Understanding the Reaction**:
- The preparation of hydrogen peroxide from barium peroxide involves the reaction of barium peroxide (BaO₂) with an acid (usually sulfuric acid). The general reaction can be represented as:
\[
\text{BaO}_2 + \text{H}_2\text{SO}_4 \rightarrow \text{H}_2\text{O}_2 + \text{BaSO}_4
...