The Color of Iodine is____

Answer: Violet.(Iodine in its powder form sublimates into a violet-pink gas. Therefore, the correct answer is option A)

Why Does Iodine Appear Violet in its Elemental (solid or gaseous) State?

The colour of Iodinine is violet. Electronic transitions in iodine molecules cause selective absorption of red light,. This results in a violet-pink colour.

1. The iodine crystals that look bluish black at room temperature are heated they change from solid to vapour. This process is called sublimation. This causes the vapour to be of violet in colour.
2. Iodine iodine (I₂) has electrons in molecular orbitals. The ionine absorbs wavelengths in the red part of visible light and re-emits or transmits the shorter (violet) wavelengths.

Does Iodine Always Look Violet, or Can Its Colour Change Under Different Conditions?

The color of Iodine is violet. However, its colour is not always violet. It can change depending on the temperature. The exact colour it takes depends on its phase – solid, liquid, or gas and the solvent if it is dissolved.

1. Solid Iodine- Iodine is blue-black at room temperature
2. Vapour (gas) iodine: When Iodine is heated, it forms a vapourised into a violent pink gas.
3. Iodine in nonpolar solvents (e.g., carbon sulfide, chloroform): When you dissolve. Iodine in a hydrocarbon solvent, it takes a purple colour, or a deep violet colour.
4. Iodine in water: When Iodine is dissolved in water, it forms a pale yellowish colour.When the concentration of the dissolved iodine is increased, it takes a dark brown colour.
5. Starch test (iodine + starch): When iodine is mixed with starch (for example, in plant cells), it takes a deep blue black colour.

Everyday Examples Where Iodine’s Colour is Important

In science class, a starch iodine test can be conducted. In the test, you can add a few drops of iodine solution to a starchy food like bread and notice that it turns the starch deep blue. This wil teach you how iodine interacts with organic molecules.

On the other hand, when dissolving elemental iodine in ethanol (along with potassium iodide), you get a brown-orange colour. This mixture is used to clean wounds. Although the solution looks brown, the iodine consists of violet photons when isolated.

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