Help with these Chemistry questions MP and Purity?

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I <3 Animals

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Can you please help me with this question. I think that the more pure a compound is the lower its temperature. So it that what I would have to say for each one?

a) For the following reported melting points, comment on the purity of the sample:

78-79 oC
299-301 oC
178 oC decomposes
137-149 oC
 
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