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Diamond is covalent, yet it has high mel...

Diamond is covalent, yet it has high melting point. Why ?

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Covalent com pound have usaully low melting point. However, the melting point of diamond is very high (4000k) on account of its highly compact structure which exists as a net work.
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Which of the following is correct regarding diamond? (i) Diamond is covalent, yet it has high melting point. (ii) It used for cutting glass, making borers for rock drilling, and for making abrasives. (iii) It is used for making precious gems and jewellery. (iv) It is used for making fies for drawing this wires from metals.

a. Select the member s of grop 14 that (i) forms the most acidic diozide (ii) is commonly found in +2 oxidation state and (iii) used as se,ocpmdictpr . (Solved NCEGT Pronlem 11.5 ) b. |SiF_5^(2-) is known, whereas |SiCl_5|^(2-) not. Glve possible preasons . (Solved NCEGT Pronlem 11.6 ) c . Diamond is covalent , yet covelnt , yet it has high melting point . Why ? (Solved NCEGT Pronlem 11.7 ) .

Assertion (A) : Covalent crystals have higher melting point. Reason (R ) : Covalent bonds are stronger than ionic bonds.

Transition elements show high melting points. Why?

Which among the following is a soft solid and has high melting point?

DINESH PUBLICATION-P BLOCK ELEMENTS (GROUP 13 AND 14 )-Concept based
  1. Diagonal Relationship Between Beryllium And Aluminium

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  2. White fumes appear around the bottle of anhydrous aluminium chloride. ...

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  3. Boron is unable to form BF(6)^(3-)– ion. Explain.

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  4. Why is boric acid considered as a weak acid ?

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  5. In elements of group 14. (a) which forms the most acidic oxide (b)...

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  6. [SiF(6)]^(2-) is a well known compound but [SiCl(6)[^(2-) is not. Expl...

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  7. Diamond is covalent, yet it has high melting point. Why ?

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  8. What are alums? Give the chemcial formulae of the following alums:

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  9. Which importan t properties of aluminium are responsible for its great...

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  10. Account for the foolowing: (a) Aluminium is not prepared by carrying...

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  11. Carbon does not form any complesses while slicon particlipates in the ...

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  12. Why is SnCl(2) more easly formed than SnCl(4)?

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  13. PbCl(4) exists but PbBr(4) and PbI(4) do not because of

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  14. Point out the false statements in the following: (a) Lead shows allo...

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  15. (a) Why is boric acid considered as a weak acid. (b) Discuss the str...

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  16. Write the reactions of B(2)H(6) with (a) H(2)O (b) O(2) (c) NH(3).

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  17. What are silicones ?

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  18. Explain structures of diborane and boric acid.

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  19. At room temperature, CO(2) is a gas while SiO(2) is a solid because

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  20. (a) W hat do ou mean by catensation? (b) C Cl(4) cannot be hydrolyse...

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