{"id":17820,"date":"2022-01-31T21:56:42","date_gmt":"2022-01-31T16:26:42","guid":{"rendered":"https:\/\/infinitylearn.com\/surge\/?p=17820"},"modified":"2022-02-07T19:34:37","modified_gmt":"2022-02-07T14:04:37","slug":"viva-questions-with-answers-on-determination-of-melting-point","status":"publish","type":"post","link":"https:\/\/infinitylearn.com\/surge\/science\/melting-point\/viva-questions-with-answers-on-determination-of-melting-point\/","title":{"rendered":"Viva Questions with Answers on Determination of Melting point"},"content":{"rendered":"

Viva Questions with Answers on Determination of Melting point<\/span><\/strong><\/h2>\n

1. Define melting point.<\/span><\/strong>
\nAns.<\/span><\/strong> It is defined as the constant temperature at which the solid and the liquid phases of sub\u00acstance coexist.
\n2. How is the determination of melting point useful ?<\/span><\/strong>
\nAns.<\/span> <\/strong>It helps us to :
\n(i) identify unknown substances ;
\n(ii) know whether a compound is pure or not.
\n3. How does the determination of melting point help us know about the purity of the compound ?<\/span><\/strong>
\nAns.<\/span><\/strong> Melting point indicates the purity of a substance. If a substance contains moisture or some other impurity, then its melting point is usually lowered. A sharp melting point indicates a pure substance.
\n4. What is sharp melting point ?<\/span><\/strong>
\nAns.<\/span> <\/strong>Melting point of a solid is said to be sharp if it melts completely within a range of 1\u00b0C.
\n5. Why do pure solids possess sharp melting point ?<\/span><\/strong>
\nAns.<\/span><\/strong> A pure solid has same force of attraction between particles at different places and hence melts at a constant temperature.
\n6. What is the effect of impurities on the melting point of solids ?<\/span><\/strong>
\nAns.<\/span><\/strong> Impurities lower the melting point of a solid.
\n7. Can we heat the capillary tube directly for the determination of melting point ?<\/span><\/strong>
\nAns.<\/span> <\/strong>No, because direct heating would result in uneven and fast heating.
\n8. Can any other liquid be used in place of liquid paraffin to determine the melting point ?<\/span><\/strong>
\nAns.<\/span> <\/strong>Yes, concentrated H2S04 or silicone oils can be used to determine the melting point.
\n9. Why is the melting point of benzamide more than that of acetamide ?<\/span><\/strong>
\nAns.<\/span><\/strong> Benzamide and acetamide contain same functional group, but the molecular mass of benzamide is more than that of acetamide. As a result benzamide has stronger intermolecular forces and hence has higher melting point.
\n10. Why different solids have different melting points ?<\/span><\/strong>
\nAns.<\/span><\/strong> Melting point depends upon intermolecular forces existing in the solid state. Since different solids have intermolecular forces of different strength, their melting points are different.<\/p>\n

 <\/p>\n","protected":false},"excerpt":{"rendered":"

Viva Questions with Answers on Determination of Melting point 1. Define melting point. Ans. 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