Which one of the following is termed as 'Dry ice' ?

Which one of the following is termed as ‘Dry ice’ ?

[amp_mcq option1=”Ice present in ice-cream” option2=”Solid water at Antarctica” option3=”Solid state of carbon dioxide” option4=”Solid water of ionosphere” correct=”option3″]

This question was previously asked in

UPSC NDA-2 – 2019

Download PDF Attempt Online

‘Dry ice’ is the common name for solid carbon dioxide ($\text{CO}_2$). At standard atmospheric pressure, solid carbon dioxide does not melt into a liquid but instead undergoes sublimation, transitioning directly from the solid phase to the gaseous phase. This is why it is called “dry ice,” as it appears as ice but doesn’t produce liquid water upon warming.
A) Ice present in ice-cream is frozen water.
B) Solid water at Antarctica is frozen water (H₂O ice).
C) Solid state of carbon dioxide is indeed dry ice.
D) Solid water of ionosphere is not a recognized term for dry ice; the ionosphere is a layer of the atmosphere where water exists primarily as gas or plasma, not solid ice.

– Dry ice is solid $\text{CO}_2$.
– Dry ice sublimes (solid to gas transition) at atmospheric pressure.
– Common ice is frozen water (solid H₂O).

Dry ice is much colder than water ice, with a sublimation temperature of -78.5 °C (-109.3 °F) at atmospheric pressure. It is used for cooling, freezing, and fog effects (by causing water vapor in the air to condense).

More similar MCQ questions for Exam preparation:-