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Explain why melting and boiling points o...

Explain why melting and boiling points of boron is much higher.

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Boron exists as a giant covalent polymer having three-dimensional network structure both in the solid and the liquid states. For this reason, its melting and boiling points are very high,
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CHHAYA PUBLICATION-SOME p-BLOCK ELEMENTS-SHORT -TYPE QUESTIONS
  1. Comment on the shapes of BF3 molecule and BF4^(-) ion.

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  2. Explain why aluminium vessel can be used for storing concentrated nitr...

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  3. Explain why melting and boiling points of boron is much higher.

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  4. p pi - p pi back bonding occurs in the case of boron halides but not i...

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  5. AIF3 is insoluble in anhydrous HF but dissolves when NaF is added to t...

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  6. Metallic aluminium is frequently used as a reducing agent in the extra...

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  7. Is boric acid a protonic acid? Explain.

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  8. When phenolphthalein is added to an aqueous solution of borax, the sol...

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  9. Explain why diamond is hard but graphite is soft.

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  10. Graphite is a conductor of electricity but diamond is not-why?

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  11. Explain why carbon monoxide is a poisonous gas.

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  12. SiCl4 undergoes easy hydrolysis but C Cl4 does not undergo hydrolysis-...

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  13. CO2 gets absorbed in alkaline solution but CO does not under ordinary ...

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  14. CO is a superior fuel-why?

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  15. How will you get pure nickel using carbon monoxide?

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  16. Explain why solid carbon dioxide is called dry ice.

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  17. Give example: Two solids combine to give a liquid.

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  18. Explain why diamond appears to be very bright and lustrous.

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  19. (SiH3)3N is weaker base than (CH3)3N- why ?

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  20. CO cannot be dried by concentrated sulphuric acid -why?

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