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Which elements of group- 13 forms only c...

Which elements of group- 13 forms only covalent compounds and why ?

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Because of small atomic size and high value of sum of first three ionisation enthalpies `(Delta_iH_1 + Delta_iH_2+Delta_iH_3)`, boron forms only covalent compounds.
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CHHAYA PUBLICATION-SOME p-BLOCK ELEMENTS-QUESTION-ANSWER ZONE FOR BOARD EXAMINATION (VERY SHORT ANSWER TYPE)
  1. Which element of group-13 has the most stable +1 oxidation state ?

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  2. Which elements of Gr-13 form amphoteric hydroxide ?

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  3. Which elements of group- 13 forms only covalent compounds and why ?

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  4. Give the general valence shell electronic configuration of group-13 el...

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  5. which one among group-13 elements has the highest value of ionisation ...

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  6. Which element of Gr- 13 is the most abudant one ?

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  7. Write one physical characteristic of boron in which it differs from th...

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  8. Why boron compounds such as BF3 are called electron deficient compoun...

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  9. Which of the Gr- 13 elements forms acidic oxide ?

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  10. Arrange the following compounds in order of decreasing strength as Lew...

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  11. Which compound is responsible for the green - edged flame in a test fo...

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  12. Name the compound which on warming produces pure BF3.

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  13. Explain why BF6^(3-) has no existence.

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  14. What type of cations are identified by borax bead test ?

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  15. What happens when borax solution is acidified ?

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  16. How are the BO3^(3-) units in boric acid linked to give layered struct...

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  17. What is the shape of BO3^(3-) ion?

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  18. Which compounds are formed on heating boric acid ?

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  19. Using balanced chemical equat io n show how B(OH)3 behaves as a monoba...

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  20. What are the forces involved between the layers of two-dimensional she...

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