Question

What do you observe on heating the test tube?

Answer 1

Answer:

When Iodine crystals are heated, the van der waals are easily overcome and the molecule breaks into gas phase. They sublime and form a purple colored dense vapor.

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Answer 2

Explanation:

If you heat the test tube from the bottom ,any liquid can turn into gas .The gas will rapidly expand shooting heated liquid out of the tube like a cannon.