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Describe the shapes of BF3 and BH4^(-) ....

Describe the shapes of `BF_3 and BH_4^(-)` . Assign the hybridisation of boron in these species.

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In `BF_3` molecule, the B -atom is `sp^2` -hybridised. Thus, `BF_3` molecule contains three bond pairs and exhibits trigonal planar geometry.

On the other hand, in `[BH_4]^(-)` , the B-atom is `sp^3` - hybridised. Thus, `[BH_4]^(-)` contains four bond pairs and exhibits tetrahedral geometry.
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CHHAYA PUBLICATION-SOME p-BLOCK ELEMENTS-SOLVED NCERT EXERCISE
  1. Is boric acid a protic acid? Explain.

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  2. Explain what happens when boric acid is heated.

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  3. Describe the shapes of BF3 and BH4^(-) . Assign the hybridisation of b...

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  4. Write reactions to justify amphoteric nature of Al.

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  5. What are electron deficient compounds? Are BCl3 and SiCl4 electron de...

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  6. Write the resonance structures of CO3^(2-) and HCO3^(-).

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  7. What is the state of hybridisation of carbon in CO3^(2-) ?

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  8. What is the state of hybridisation of carbon in diamond ?

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  9. What is the state of hybridisation of carbon in graphite?

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  10. Explain the difference in properties of diamond and graphite on the ba...

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  11. Rationalise the statement and give reaction : Lead (II) chloride rea...

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  12. Rationalise the statement and give reaction : Lead (IV) chloride is ...

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  13. Rationalise the statement and give reaction : Lead is known not to f...

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  14. Suggest reasons why the B-F bond lengths in BF3 (130 pm) and BF4^(-) (...

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  15. If B-Cl bond has a dipole moment, explain why BCl3 molecule has zero d...

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  16. Aluminium trifluoride is insoluble in anhydrous HF but dissolves on a...

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

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  18. How does the increase in the amount of CO2 in the atmosphere lead to g...

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  19. Explain structures of diboroane and boric acid.

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  20. What happen when Borax is heated strongly.

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