Which of the following statements is true regarding the recovery of refrigerants?

The statement that different refrigerants must not be mixed in the same container is true because mixing refrigerants can lead to safety hazards and inefficiencies in the recovery process. Each type of refrigerant has different physical and chemical properties, which, when combined, can create unpredictable reactions and affect the overall performance of the system. Additionally, a mixed refrigerant can complicate the recycling and reclamation processes, making it difficult to purify the refrigerant for reuse. This is why regulations typically require that refrigerants be recovered and stored separately to ensure safety, maintain the integrity of the refrigerant properties, and comply with environmental standards.

The other statements lack validity due to regulatory requirements and best practices in the refrigeration and air conditioning field. For instance, recovery of refrigerants must be performed using certified equipment to ensure that the process is conducted safely and effectively, and it is illegal to mix refrigerants, even if the container is labeled. Mixing refrigerants can hinder their recovery, recycling, and disposal, which poses environmental risks.