Final answer:
The toxic, odorless gas often used as a sterilizing agent is ethylene oxide, which is highly effective for sterilizing heat-sensitive items. However, it should be used with caution due to its carcinogenic and explosive nature.
Step-by-step explanation:
The toxic, odorless gas often used as a sterilizing agent in hospitals and dental offices is ethylene oxide.
Ethylene oxide is a type of alkylating agent that is highly penetrating and can sterilize heat-sensitive items such as catheters and disposable laboratory equipment. It is effective for sterilizing packaged materials and is commonly found in medical settings for this purpose.
However, it is important to use ethylene oxide with caution as it is carcinogenic and highly explosive.