What is the colour of iodine gas?

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Study for the IGCSE Edexcel Chemistry Test. Access flashcards and multiple choice questions with hints and explanations. Get ready for your exam!

Multiple Choice

What is the colour of iodine gas?

Explanation:
When a substance changes from solid to gas, its colour in the gas phase may be different from its solid appearance. Iodine, a halogen, sublimates when heated, turning directly into a violet–purple vapour. The solid form of iodine, by contrast, looks like a dark grey or almost black crystal. So the colour you see when iodine is in the gas state is purple.

When a substance changes from solid to gas, its colour in the gas phase may be different from its solid appearance. Iodine, a halogen, sublimates when heated, turning directly into a violet–purple vapour. The solid form of iodine, by contrast, looks like a dark grey or almost black crystal. So the colour you see when iodine is in the gas state is purple.

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