BioMedical Admissions Test (BMAT) 2025 – 400 Free Practice Questions to Pass the Exam

Iodine in its solid form exhibits the property of being a dark grey crystalline solid. This characteristic arises from the molecular structure of iodine, which exists as diatomic molecules (I₂). These molecules aggregate to form a solid that appears as dark grey crystals. The solid state of iodine can vary slightly in appearance based on crystallization conditions, but the predominant and recognizable form retains this dark coloration, which is a hallmark of iodine in its crystalline state.

In contrast to the properties described in the other options, iodine does not appear as a pale yellow crystalline solid; rather, that description could more closely relate to certain compounds or the visual perception of particulate iodine under certain lighting. Additionally, while iodine can sublimate into a gas, in solid form it is not a colorless gas; its gaseous state has a characteristic violet color. Lastly, iodine does not exist as a bright blue liquid under standard conditions; it is typically a brownish color in its liquid phase, if it melts from the solid state. Thus, the solid form of iodine is unmistakably identified by its dark grey crystalline structure, which is the defining answer to the question.