51. The change of state of ice into water vapour is known as:

A. Deposition
B. Sublimation
C. Melting
D. Condensation
✅ The correct answer is option B.
When ice turns directly into water vapor without first transitioning into a liquid, it is referred to as “sublimation.” In fact, any solid that turns into a vapor without going through the liquid phase can be said to sublime or “sublimate.”

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