What should you do to all connections and wheels when loading or unloading chlorine hazmat?

When loading or unloading chlorine hazmat, it is essential to prioritize safety and stability. Unhooking connections ensures that there are no active links that could leak, allowing for a safer environment while handling hazardous materials. This process minimizes the risk of accidental discharge during loading and unloading, which is crucial when dealing with substances like chlorine that can pose significant health and environmental hazards if released.

Chocking the wheels is a vital safety measure as well. By chocking the wheels, you prevent the vehicle from rolling or moving unexpectedly while the loading or unloading process occurs. This step is critical for maintaining control over the vehicle, ensuring that it remains stationary and secure, thus further reducing the risk of accidents or leaks.

The other options, while they contain some elements relevant to safe practices, do not encompass the necessary precautions specifically relevant to handling chlorine hazmat. Ensuring connections are secure or wheels are inflated does not directly address the critical risks involved with chlorination or hazardous materials handling. Therefore, unhooking connections and chocking the wheels is the most appropriate and safety-conscious approach in this scenario.