Final answer:
The nurse should issue a black disaster tag to a client who is deceased or expected to die.
Step-by-step explanation:
The nurse should issue a black disaster tag to a client who is deceased or expected to die. In a mass casualty incident like an explosion, triaging victims is essential to prioritize medical care based on the severity of injuries. The black disaster tag is typically used for victims who have suffered severe injuries and are not expected to survive.