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Answers
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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