🔍 Key Concepts

• Hazard classes for dangerous goods under the IMDG Code (International Maritime Dangerous Goods Code) • The typical uses and hazards of barium oxide as an industrial chemical • Which label wording corresponds to toxic/poisonous substances versus biological, radioactive, or flammable hazards

💭 Think About

• Ask yourself: What is the primary health hazard of barium compounds when swallowed, inhaled, or contacting skin? • Consider whether barium oxide is associated with infection, radioactivity, self‑heating/ignition, or toxicity. • Match that primary hazard to the correct standard label wording used on international dangerous goods shipments.

✅ Before You Answer

• Verify which IMDG hazard class barium oxide belongs to before matching the label text. • Check that the label you choose matches a chemical toxicity hazard, not a biological or nuclear one. • Confirm that "Spontaneously Combustible" applies to substances that can self‑ignite in air without an external ignition source—does barium oxide behave that way?