Hydrogen peroxide can be preapared by the action of dil. `H_(2)SO_(4)` or `H_(3)PO_(4)` on barium peroxide or by bubbling peroxide . On an industrial scale, it can be prepared by hydrolysis of peroxodisulphuric acid obtained by electrolysis of 50% `H_(2)SO_(4)` or an equimolar mixture of `H_(2)SO_(4)` and ammonium sulphate . The strength of `H_(2)O_(2)` solution can be expressed in a number of ways namely normality , molarity , percentage strength and volume strength . Volume strength refers to the volume of `O_(2)` produced at N.T.P. by decomposition of 1 mL of `H_(2)O_(2)` solution. `H_(2)O_(2)` acts as an oxidising as well as reducing agent both in acidic and basic media.
The correct increasing order of the acidity of `CO_(2), H_(2)O and H_(2)O_(2)` is

Options

A. `CO_(2) lt H_(2)O_(2) lt H_(2)O`
B. `H_(2)Olt H_(2)O_(2) lt CO_(2)`
C. `H_(2)O lt H_(2)O_(2) gt CO_(2)`
D. `H_(2)O_(2) gt CO_(2) gt H_(2)O`

Explanation

To determine the increasing order of acidity for CO₂, H₂O, and H₂O₂, we can analyze the acidic properties of each compound step by step.

### Step 1: Understanding the Compounds
- **CO₂ (Carbon Dioxide)**: When CO₂ dissolves in water, it forms carbonic acid (H₂CO₃), which is a weak acid. This indicates that CO₂ can contribute to acidity when in solution.
- **H₂O (Water)**: Water is amphoteric, meaning it can act as both an acid and a base. However, it is generally considered neutral and has a very weak acidic nature.
- **H₂O₂ (Hydrogen Peroxide)**: Hydrogen peroxide is also a weak acid, but it is less acidic than carbonic acid.

### Step 2: Comparing Acidity
- **CO₂**: Forms carbonic acid in solution, which is more acidic than water and hydrogen peroxide.
- **H₂O₂**: Acts as a weak acid but is less acidic than carbonic acid. It is more acidic than water.
- **H₂O**: Generally neutral and has the least acidic character among the three.

### Step 3: Establishing the Order
From the analysis:
- CO₂ is the most acidic because it forms carbonic acid.
- H₂O₂ is more acidic than H₂O but less acidic than CO₂.
- H₂O is the least acidic.

### Conclusion
Thus, the correct increasing order of acidity is:
**H₂O < H₂O₂ < CO₂**