Which statement about acetylene storage safety is supported by the material?

• A. Acetylene should always be stored in pure form
• B. Acetylene is unstable above 15 psi
• C. Acetylene is stable at any pressure
• D. Acetylene requires no acetone

Answer: (B)

Acetylene must be stored under very low pressure or dissolved in a stabilizing solvent because it becomes unstable and can decompose or explode if 압s kept above certain pressures. The material emphasizes that acetylene is unstable above about 15 psi, which is why it’s stored in specialized cylinders with acetone acting as a solvent to stabilize the gas. This is the safe-storage principle being tested. The other statements conflict with standard practice: acetylene is not stored in pure form, it does rely on acetone as a stabilizer, and it is not stable at all pressures.