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Why ureas has a sharp melting point but ...

Why ureas has a sharp melting point but glass does not ?

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Urea is a crystalline solid whereas glass is amorphous. Crystalline solids have sharp melting points whereas amorphous solids do not posses sharp melting points.
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PRADEEP-STATES OF MATTER: SOLID MATTER-ANALYTICAL (QUESTION)
  1. Why ureas has a sharp melting point but glass does not ?

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  2. The mineral haematite, Fe(2)O(3) consists of a cubic close packed ar...

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  3. Zine oxide is white but it turns yellow on heating . Explain.

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  4. Why does zinc oxide exhibit enhanced electrical conducity on heating ?

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  5. The electrical conductivity of a metal decreases with rise in temperat...

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  6. The ions of NaF and MgO have the same number of electrons and inter nu...

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  7. Diamond and solid rhombic sulphur both are covalent solids but the lat...

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  8. NaCl and CsCl have similar formular . Then why they have differnet st...

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  9. Why is coordination number of 12 not found in lonic crystals ?

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  10. Analyses shows that FeO has a non-stoichiometric composition with form...

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  11. ZnO crystals on heating acquires the formuls Zn(1+x)O. Or There is...

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  12. If the atoms of an element have the radius r, then in a primitive cubi...

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  13. Out of NaCl and CsCl , which one is more stable and why ?

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  14. In a crystal, Frenkel defect is not shown by alkali metal halides but ...

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  15. What is the arrangement of atoms in the lattice structure of diamond a...

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  16. The figures given below show the location of atoms in three crystallog...

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  17. r(Na^(+))" and " r(Cl^(-)) represent radius of Na^(+) and Cl^(-) ions ...

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