Final answer:
option b,The shelf life of hydrogen peroxide depends on concentration and storage conditions. A 3% solution can last 6 months to 1 year once opened. Proper storage in a cool, dark place is essential to maintain effectiveness.
Step-by-step explanation:
The shelf life of hydrogen peroxide usually depends on the concentration and storage conditions. Generally, a 3% hydrogen peroxide solution, which is commonly used as a household disinfectant, has a shelf life of about 1 to 2 years when unopened. However, once opened, the shelf life can be shorter, typically lasting for 6 months to 1 year.
The decomposition of hydrogen peroxide can be influenced by factors such as light, temperature, and the presence of impurities. Exposure to light and higher temperatures can accelerate the decomposition process, reducing the effectiveness of hydrogen peroxide over time. Therefore, it's important to store hydrogen peroxide in a cool, dark place, tightly closed to prevent contact with air.
For example, if you have a bottle of 3% hydrogen peroxide, it is recommended to discard it after 6 months of opening, as it may have already lost its potency.