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How does velence bond theory, explain th...

How does velence bond theory, explain the existence of `H_(2)` but non-existence of `He_(2)`?

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According to valence bond theory, a covalent bond is formed by overlap of half-filled atomic orbitals :
H-atoms have half-filled orbitals `(1s^(1))` but He atoms have fully filled orbitals `(1s^(2))`.
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PRADEEP-CHEMICAL BONDING AND MOLECULAR STRUCTURE-ADDITIONAL QUESTIONS (VERY SHORT ANSWER QUESTIONS )
  1. On the basis of VESPR theory predict the shape of H(3)O^(+) ion.

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  2. On the basis of VSEPR theory, explain why ozone is a bent molecule and...

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  3. How does velence bond theory, explain the existence of H(2) but non-ex...

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  4. What orbitals can overlap to form a sigma-bond and which orbitals can...

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  5. Why free rotation about a pi-bond is not possible ?

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  6. Arrange in order of increasing bond strengths : F(2), N(2), O(2), Cl(2...

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  7. Arrange the molecules H(2), O(2), F(2) and N(2) in order of increasing...

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  8. Which of the following has maximum bond angle ? H(2)O, CO(2), NH(3), ...

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  9. Arrange the following in order of increasing ionic character : C-H,F...

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  10. Predict the dipole moment of a molecule of the type AX(4) with square ...

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  11. What are SI units of dipole moment?

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  12. Which of the following molecule/moleculas will have zero dipole moment...

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  13. Why covalent molecules show isomerism but ionic compound do not ?

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  14. What is the hybridisation of the central atom in (i) H(3)O^(+) (ii) Xe...

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  15. Name one compound each involving sp^(3) , sp^(2) and sp hybridisatio...

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  16. Name the shapes of the following molecules : CH(4) , C(2)H(2)m CO(2)

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  17. What type of hybridisation is involved in SF(6) ?

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  18. Write the state of hybridisation of boron in BF(3^.)

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  19. Give the structure of sulphur tetrafluoride .

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  20. BH(4)^(-) and NH(4)^(+) are isolobal . Explain.

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