Which one of the following substances shows sublimation behaviour or property at standard temperature and pressure ?

Sublimation is the phase transition where a substance changes directly from a solid to a gas without passing through the intermediate liquid phase. Solid carbon dioxide (CO₂), commonly known as "dry ice," is a classic example of a substance that exhibits this property at standard atmospheric pressure.

• At 1 atmosphere of pressure, the triple point of CO₂ is not reached; therefore, it cannot exist as a liquid. It sublimes at approximately -78.5°C.
• At Standard Temperature and Pressure (STP), which is 0°C and 1 atm, solid CO₂ is far above its sublimation point and will rapidly convert into gas.
• Water at STP is at its freezing/melting point and does not primarily sublime. Liquid nitrogen is a liquid that boils into gas at STP (boiling point -196°C). Iron is a solid with a very high melting point.