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How will check the purity of a pure chem...

How will check the purity of a pure chemical compound in the solid state ?

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The purity of a pure chemical compound can be checked by finding its melting point experimentally and by comparing it with its standard melting point value available in the form of tables. In case, the two values are nearly the same, the substance is pure. Otherwise, it is not.
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DINESH PUBLICATION-IS MATTER AROUND US PURE-Very Short Answer Questions
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  10. How will you justify that rusting of iron is a chemical change ?

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  18. What is dispersed phase and dispersion medium in a colloid ?

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