A reaction-interfering agent is an example of which safety feature?

• A. Primary containment
• B. A quenching system
• C. An emergency abort system
• D. BPCS

Answer: (C)

The key idea is stopping a process in an abnormal situation by interrupting the reaction chemically. A reaction‑interfering agent is used to quickly interrupt the chemistry driving the reaction, rapidly halting heat generation and reactive steps. That fits the function of an emergency abort system, which is designed to stop the process in response to deviations or alarms. Primary containment deals with keeping materials in, not stopping the reaction itself; a quenching system cools or slows the reaction but is part of how a quench is implemented, whereas the broader safety feature described here is the system intended to abort the process. BPCS is the general control system, not the specific safety action to abort the reaction. So, the reaction‑interfering agent is an example of an emergency abort system.