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Use molecular orbital theory to explain ...

Use molecular orbital theory to explain why to `Be_2` molecule does not exist.

Text Solution

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Molecular orbital diagram for `Be_2` is as follows:

Bond order `=(1)/(2)[4-4]=0`
Since bond order of `Be_2` is zero. Hence, the molecule does not exist, because molecule only exist if bond order `gt` zero.
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OMEGA PUBLICATION-CHEMICAL BONDING AND MOLECULAR STRUCTURE -MULTIPLE CHOICE QUESTIONS
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  2. A crystal has highest meltiing point. It is

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  3. Which one of the following has the shortest carbon carbon bond length?

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  4. The percentage of s- character in the hybrid orbitals sp, sp^(2)" and ...

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  5. In the co-ordinate valency

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  6. Which of the following has a net dipole moment?

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  7. Which of the following is diamagnetic?

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  8. In which one of the following sp^2 hybridisation?

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  9. The shape of sulphate ion is

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  10. The bond order for a species with the configuration, sigma1s^(2), sigm...

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  11. Which of the following is paramagnetic?

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  12. Compare the relative stability of the following species and indicate t...

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  13. Which one shows maximum hydrogen bonding?

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  14. The weakest amoung the following types of bonds is

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  15. According to Fajan's rules covalent bonding is favourable by

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  16. The number of pi bonds in structure given are (NC)(2) C=C(CN)2

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  17. Which of the following compound is covalent?

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  18. Antibonding MO is formed by

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  19. In a hononuclear molecules, which of the following set of orbitals is...

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  20. Covalent compounds are soluble in

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  21. Which of the following has the largest de Broglie wavelength (all have...

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