Question

how we can separate sand with iodine solution​

Answer 1

Explanation:

Iodine undergoes sublimation i.e changes directly from solid to gas, when heated. So when the mixture of iodine and sand is taken in a China dish and keeping an closed inverted funnel on it, the iodine changes into vapour, gets solidified and will be collected on the walls of the funnel.

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Answer 2

Explanation:

Iodine is a solid that sublimes. If a mixture of iodine and sand is heated in a beaker, the iodine changes from solid to vapour directly. The vapour changes back to solid directly on a cold surface. The sand is not affected by the heat and remains in the beaker.