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p pi - p pi back bonding occurs in the c...

`p pi - p pi` back bonding occurs in the case of boron halides but not in the case of aluminium halides-why?

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The tendency of `p pi-p pi` back bonding decreases with increase in the size of the central atom. Since Al is larger in size than B, `p pi-p pi` back bonding does not take place in case of Al
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CHHAYA PUBLICATION-SOME p-BLOCK ELEMENTS-SHORT -TYPE QUESTIONS
  1. Explain why aluminium vessel can be used for storing concentrated nitr...

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

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

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

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

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  6. Is boric acid a protonic acid? Explain.

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

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

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

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  10. Explain why carbon monoxide is a poisonous gas.

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

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

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  13. CO is a superior fuel-why?

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

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

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

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

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

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

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  20. N(CH3)3 is pyramidal but N (SiH3)3 is planar-explain.

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