State the methods of purification used for solids.
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Explanation:
Recrystallization
Recrystallization is one of the most important methods used to purify solid organic compounds. The substance is dissolved in a minimum amount of hot solvent and crystallizes as the solution becomes saturated with respect to the substance, which happens as the solvent cools.
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Explanation:
a-atmosphere
b-geosphere
c-hydrosphere
d-biosphere
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