hich of the following can be used to prevent the decomposition of H2O2 ?UreaFormaldehydeFormic acidEthanol

The decomposition of hydrogen peroxide (H2O2) can be prevented by using stabilizers. Among the options provided, urea can be used as a stabilizer to prevent the decomposition of H2O2.

Here's a step-by-step explanation:

1. Hydrogen peroxide (H2O2) is a powerful oxidizer that is unstable and decomposes easily, especially when exposed to light or heat.

2. To prevent this decomposition, stabilizers are often added to solutions of H2O2.

3. Urea is one such stabilizer. It reacts with H2O2 to form a stable non-volatile complex, thus preventing the decomposition of H2O2.

4. The other options provided - formaldehyde, formic acid, and ethanol - are not typically used as stabilizers for H2O2.

So, the correct answer is Urea.