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Comment on the shapes of BF3 molecule an...

Comment on the shapes of `BF_3` molecule and `BF_4^(-)` ion.

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CHHAYA PUBLICATION-SOME p-BLOCK ELEMENTS-SHORT -TYPE QUESTIONS
  1. BF3 is a weaker Lewis acid than BCl3 -why?

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  2. How can you identify a cobalt salt by borax bead test?

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  3. Comment on the shapes of BF3 molecule and BF4^(-) ion.

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

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

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

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

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

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  9. Is boric acid a protonic acid? Explain.

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

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

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

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  13. Explain why carbon monoxide is a poisonous gas.

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

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

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  16. CO is a superior fuel-why?

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

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

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

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

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