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Suggest reasons why the B–F bond lengths...

Suggest reasons why the B–F bond lengths in `BF_(3)` (130 pm) and `BF_(4 )^(– )`(143 pm) differ.

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CBSE COMPLEMENTARY MATERIAL-P-BLOCK ELEMENTS-2-MARK QUESTION
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  2. Write chemical reactions to show the amphoteric nature of water.

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  3. Suggest reasons why the B–F bond lengths in BF(3) (130 pm) and BF(4 )^...

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  4. Give reason for the following BF(3) act as weak Lewis acid.

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  5. Give reason for the following Boron cannot show covalency more than ...

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  6. How can you explain higher stability of BCI(3) as compared to TICI(3)?

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  7. Give reasons: Aluminium alloys are used to make aircraft body.

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  8. Give reasons: Aluminium wire is used to make transmission cables.

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  9. Describe the shapes of BF(3) and BH(4)^(ө). Assign the hybridisation o...

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  10. Explain the chemistry of borox bead test.

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  11. [SiF(6)]^(2-) is known where as [SiCl(6)]^(2-) not. Reason is

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  12. At room temperature, CO(2) is a gas while SiO(2) is a solid because

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  13. Why is solid carbon dioxide known as dry ice ?

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  14. Elemental silicon does not form a graphtie like structure. Explain.

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  15. Suggest a reason as to why CO is poisonous.

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  16. How is excessive content of CO(2) responsible for global warming?

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  17. What is allotropy ? Name two elements which exhibit allotrophy.

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