A Student was assigned by his teacher to test the melting point of a given solid sample it starts melting at 95-101°C but does not melt complete until the temperature is 113°C.According to a data book,the melting point of the sample is 115°C.is the unknown solid sample a Pure substance or mixture? Why?
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because based on the test the solid given is totally a tough so the billing point cannot melt it to liquid