Which statement about liquid oxygen is true?

• A. It has a boiling point around -297.3°F.
• B. It is more bulky and costly to store than gas oxygen.
• C. It cannot be stored at all.
• D. It is always used in liquid form at room temperature.

Answer: (A)

Liquid oxygen is a cryogenic liquid, meaning it exists as a liquid only at extremely low temperatures. Its boiling point is about −183°C, which is roughly −297°F. At any temperature higher than that, it boils away into a gas. That’s why the true statement describes its boiling point as around −297.3°F—this reflects the fundamental property that keeps LOX as a liquid only in very cold conditions and explains why it must be stored in specialized cryogenic equipment. The other statements misstate how LOX behaves: oxygen is a gas at room temperature, so it isn’t used in liquid form there; it can be stored but only in cryogenic containers, not in ordinary conditions; and while storage logistics are indeed specialized and costly, the defining fact highlighted here is the extremely low boiling point.