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LiF is ionic but BeF2 is covalent. Comme...

LiF is ionic but `BeF_2` is covalent. Comment.

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The electronegativity difference between elements of LiF is 3 and of `BeF_2` is 2.5. Both are expected to be ionic. But due to high polarisation ability of `Be^(2+)` ion, `BeF_2` is not pure ionic. It is more covalent.
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AAKASH SERIES-CHEMICAL BONDING-OBJECTIVE EXERCISE -3 (RECENT AIPMT/NEET QUESTIONS )
  1. LiF is ionic but BeF2 is covalent. Comment.

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  2. In which of the following pairs, the two species are isostructural?

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  3. The correct order of increasing bond angles in the following triatomic...

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  4. In which of the following molecules/ions BF(3), NO(2),NH(2) and H(2)O ...

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  5. Four diatomic species are listed below in different sequencies. Which ...

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  6. According to MO theory which of the lists rank the nitrogen species in...

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  7. What is the dominant intermolecular force or bond that must be overcom...

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  8. In which of the following pairs of molecules/ ions, the central atoms ...

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  9. Which one of the folllowing species does not exist under normal condit...

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  10. In which one of the following species the central atom has the type of...

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  11. Some of the properties of the two species, NO(2)^(-) and H(3)O^(+) are...

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  12. In which of the following molecules the central atom does not have sp^...

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  13. Which of the following has the minimum bond length?

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  14. Which of the two ions from the list given below that have the geometry...

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  15. The correct order of increasing bond length of C-H, C-O, and C=C is

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  16. The pairs of species of oxygen and their magnetic behaviour are noted ...

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  17. Bond order of 1.5 is shown by

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  18. Which of the following species contains thre bond pairs and one Ione p...

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  19. The pair of species with the same bond order is

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  20. During change of O(2) to O(2)^(-) ion, the electron adds on which one ...

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  21. Four diatomic species are listed below. Identify the correct order in ...

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