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F(2) has lower bond dissociation enthal...

`F_(2)` has lower bond dissociation enthalpy than `Cl_(2)`. Why?

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The bond dissociation enthalpy of `F_(2)` is lower than that of `Cl_(2)`. It is due to the relatively large interelectronic repulsions between the lone pairs in the relatively smaller 2p-orbitals of fluorine atoms in `F_(2)` molecules where they are much closer to each other than in case of `Cl_(2)` due to larger size of Cl atom.
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ARIHANT PUBLICATION-GROUP 17 ELEMENTS : HALOGEN FAMILY-QUESTIONS FOR PRACTICE (Very Short Answer Type Questions)
  1. Concentrated hydrogen fluoride exists in the molecular formula of .......

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  2. Arrange the following in order of increasing size: Cl, Cl^+ , Cl^-

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  3. F(2) has lower bond dissociation enthalpy than Cl(2). Why?

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  4. Explain why halogens are strong oxidising agents.

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  5. SnCl(4) is more covalent than SnCl(2).

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  6. What is the oxidation number of oxygen in OF(2)?

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  7. Give two examples to show the anomalous behaviour of fluorine.

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  8. Why hydrofluoric acid is the weakest of all the halogen acids ?

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  9. Which acid is used to draw picture on glass?

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  10. What happens when fluorine is passed through conc. NaOH solution?

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  11. What happens when chlorine gas is passed through cold solution of NaOH...

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  12. Give the reason for bleaching action of Cl(2).

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  13. Name two poisonous gases which can be prepared from chlorine gas.

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  14. What is the role of MnO2 in the preparation of Cl2 from HCI?

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  15. Account for the following. Iron on reaction with HCl forms FeCl(2) and...

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  16. Why is ICl more reactive than I(2)?

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  17. Give reason for the following: F(2) is more reactive than ClF(3) b...

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  18. Why ClF(3) exists, whereas FCl(3) does not exist explain?

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  19. Draw the structure of BrF(3).

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  20. Draw the structure of ClF(3).

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