What color is iodine solid and its gas
The Correct Answer and Explanation is:
Iodine in its solid form is a metallic-looking purple-black or dark gray color. When iodine solid is heated, it sublimes (changes directly from solid to gas) and forms a violet or purple vapor. This characteristic color makes iodine easily identifiable both as a solid and as a gas.
The solid form of iodine is composed of iodine molecules (I₂) arranged in a crystalline structure. The dark color of the solid is due to the absorption of certain wavelengths of light by the iodine molecules, which allows the remaining light to reflect in a way that produces the dark hue. The color is also a result of iodine’s relatively high atomic weight and its ability to absorb light in the visible spectrum.
When iodine solid sublimes, it turns into a violet-colored gas. This is because iodine vapor absorbs light in the visible spectrum, especially the blue end of the spectrum, and re-emits it as a violet hue. The intensity of the violet color in the gas can vary depending on the concentration of iodine molecules present. In a well-ventilated room or a low concentration, the gas may appear faintly violet, while a high concentration in a confined space may produce a darker, more vivid purple color.
This color change from purple-black solid to violet gas is one of the key properties of iodine and is often used in laboratory experiments as a way of demonstrating the process of sublimation. The change in color is a physical property and is important in understanding iodine’s phase transitions and its behavior in different states of matter.
