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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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Diamond has three dimensional network structure involving strong C-C bonds These bonds are difficult to break and hence the melting point of diamond is very high.
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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?

PRADEEP-SOME p-BLOCK ELEMENTS-NCERT QUESTIONS AND EXERCISES WITH ANSWERS (NCERT INTEXT SOLVED QUESTIONS)
  1. In elements of group 14. (a) which forms the most acidic oxide (b)...

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  2. [SiF(6)]^(2-) is known where as [SiCl(6)]^(2-) not. Reason is

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

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  4. What are silicones ?

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  5. What happens when (a) Borax is heated strongly, (b) Boric acid is ...

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  6. Explain the following reactions (a) Silicon is heated with methyl ch...

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  7. Give reasons : (i) Conc. HNO(3) can be transported in aluminium con...

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  8. Explain why is there a phenomenal decrease in ionisation enthalpy from...

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  9. How would you explain the lower atomic radii of Ga as compared to Al?

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  10. What are allotropes? Sketch the structure of two allotropes of carbon ...

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  11. a. Classify following oxides as neutral, acidic, basic or amphoteric: ...

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  12. In some of the reactions, thallium resembles aluminium whereas in othe...

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  13. When metal X is treated with sodium hydroxide, a white precipitate (A)...

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  14. What do you understand by (a) inert pair effect (b) allotropy and (c...

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  15. A certain salt X gives the following results: (i) Its aqueous soluti...

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  16. Write balanced equations for the following: (i) BF(3)+LiHrarr (ii) B...

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  17. Give one method for industrial preparation and one for laboratory prep...

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  18. Aqueous solution of \(AlCl{3}\)is (A) acidic (B) basic (C) ampho...

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  19. Boric acid is polymeric due to (a) its acidic nature , (b) the pres...

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  20. The type of hybridisation of boron in diborane is (a) sp , (b) sp^(...

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