The correct sequence is 1, 3, 2. First, sublimation separates naphthalene. Next, filtration separates sand from the salt solution. Finally, evaporation separates common salt from water and gives the remaining salt.
You are given a mixture of sand, common salt and naphthalene (Fig. 5.25a). The Fig. 5.25b depicts various steps used to separate the components of this mixture. Identify and write down the correct sequence of separation techniques.
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The correct sequence is 1, 3, 2. Step 1 uses sublimation to separate naphthalene because it changes directly into vapour on heating. The remaining sand and common salt are treated with water to dissolve the salt. Step 3 uses filtration to separate the insoluble sand. Finally, step 2 uses evaporation to remove water and obtain common salt as the remaining solid.
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