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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 a three-dimensional network involving strong C—C bonds, which are very difficult to break and, in turn has high melting point.
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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?

NCERT-THE P-BLOCK ELEMENTS -EXERCISE
  1. Diamond is covalent, yet it has high melting point. Why ?

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  2. Discuss the pattern of variation in the oxidation states of (a)B to TI...

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  3. How can you explain higher stability of BCI(3) as compared to TICI(3)?

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  4. Why does boron trifluoride behave as a Lewis acid?

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  5. Consider the compounds, BCl(3) and C Cl(4).How will they behave with w...

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  6. Is boric acid a protic acid? Explain.

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  7. Explain what happens when boric acid is heated.

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  8. Describe the shapes of BF(3) and BH(4)^(ө). Assign the hybridisation o...

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  9. Write reaction of justify amphoteric nature of aluminium.

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  10. What are electron-deficient compounds? Are BCl(3) and SiCl(4) electron...

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  11. Write the resonance structure of CO(3)^(2-) and HCO(3)^(ө).

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  12. What is the state of hybridisation of carbon in (a)CO(3)^(2-), (b) dia...

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  13. Explain the difference in properties of diamond and graphite on the ba...

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  14. Rationalise the given statements and give chemical reactions. a. Lea...

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  15. Suggest reasons why the B–F bond lengths in BF(3) (130 pm) and BF(4 )^...

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  16. If B-Cl bond has a dipole moment, explain why BCl(3) molecule has zero...

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  17. AlF(3) is insoluble in anhydrous HF but dissolves on addition of NaF. ...

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  18. Suggest a reason as to why CO is poisonous.

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  19. How is excessive content of CO(2) responsible for global warming?

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  20. Explain structures of diborane and boric acid.

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

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