Final answer:
option b,Bleaches, not formaldehyde, have a very high pH and are capable of causing significant damage to skin and eyes due to their corrosive nature.
Step-by-step explanation:
The substances that are a form of formaldehyde, have a very high pH, and can damage the skin and eyes are bleaches. Bleaches contain chemical substances that are highly reactive and dangerous upon skin contact or ingestion. They are strong oxidizing agents and, due to their high pH, can cause severe corrosive damage. Formaldehyde, on the other hand, is sold as a solution called formalin which contains about 37% to 40% formaldehyde by weight, and it is primarily used to preserve biological specimens or for embalming. It's not usually associated with high pH levels. Therefore, out of the provided options, bleaches are more likely to fit the description of being highly alkaline and capable of causing skin and eye damage.
Phenolic disinfectants are a form of formaldehyde that have a very high pH and can damage the skin and eyes. They are stable, long-acting disinfectants that denature proteins and disrupt membranes. Phenolic disinfectants are commonly found in household cleaners, mouthwashes, and hospital disinfectants, and are also used to preserve harvested crops.