`H_(2)O_(2)+Cl_(2)to 2HCl+O_(2)`
In the above reaction, `H_(2)O_(2)` act as _______.

Explanation

To determine how hydrogen peroxide (H₂O₂) acts in the reaction with chlorine (Cl₂) to produce hydrochloric acid (HCl) and oxygen (O₂), we can analyze the changes in oxidation states of the elements involved in the reaction.

### Step-by-Step Solution:

1. **Write the Reaction**:
The reaction given is:
\[
H_2O_2 + Cl_2 \rightarrow 2HCl + O_2
...