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What is the structural unit present in a...

What is the structural unit present in all allotropic forms of boron ?

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`B_12` icosahedral units.
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CHHAYA PUBLICATION-SOME p-BLOCK ELEMENTS-QUESTION-ANSWER ZONE FOR BOARD EXAMINATION (VERY SHORT ANSWER TYPE)
  1. What are the forces involved between the layers of two-dimensional she...

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  2. What is the composition of the transparent glassy bead obtained on hea...

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  3. What is the structural unit present in all allotropic forms of boron ?

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  4. What type of bonds are present in B2H6 molecule ?

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  5. Explain why boron connot form B^(3+) ions.

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  6. Mention the states of hybridisation of boron in B2H6 and in BF3.

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  7. Crystalline boron is an extremely hard solid - why ?

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  8. What are boranes ?

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  9. Boron shows anomalous behaviour and differs from the rest the members...

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  10. Which two out of five members of carbon family are distinctly metals ?

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  11. Which one out of catechol, resorcinol and quinol can be used to titrat...

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  12. Carbon forms covalent compounds but lead forms ionic compounds-Why?

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  13. Which element of carbon family has no d-orbital in its valence shell?

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  14. Among the group-14 elements which is the most electronegative one?

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  15. Which member of carbon famil y has the lowest melting point?

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  16. Which is the more stable oxidation state of Pb ?

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  17. Out of diamond & graphite which is a good conductor of electricity and...

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  18. Which member of carbon family has the highest value of first ionisatio...

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  19. Which member of carbon family has the maximum tendency to exhibit cate...

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  20. What are the structural units of ice and dry ice?

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