Question

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Answer 1

Explanation:

(The mixture of naphthalene and sodium chloride can be separated by the process of sublimation as naphthalene is a sublime, i.e. it turns into vapour without changing in liquid and its vapour change into solid without changing into liquid, while sodium chloride is not a sublime.

Activity:

Materials required: China glass, funnel, tripod, gas burner, spatula, cotton.

• Place the china dish over a wire gauze placed over a tripod stand.

• Cover the china dish with an inverted glass funnel and plug in a little cotton at the opening stem.

• On heating the mixture, white fumes evolve.

• Stop heating when the fumes stop rising and allow the funnel to cool.

• On cooling, remove the funnel and transfer the solid ammonium chloride sticking on the walls of funnel to a watch glass.

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