Question

9- A given sample is found to have a fixed sharp melting point. Can you regara u a mixture. Explain. 10-A substance when heated in excess of air form carbon dioxide as the only hatanes an element or a compound. Give reason for uur

JEE/Engineering Exams

Chemistry

Solution

122

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The temperature at which a solid melts is known as the melting point ( (M P) ) of that substance. The melting point is a physical property of a solid and can be used to help identify a substance. In practice, a solid usually melts over a range of temperatures rather than at one specific temperature. For this reason it is more useful to speak of a melting point range. Although the term "melting point" is usually used, what is meant is "melting point range". If the compound melts over a very narrow range, it can usually be assumed that the compound is relatively pure. Conversely, compounds that melt over a wide range are assumed to be relatively impure