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F2 has lower bond dissociation enthalpy ...

`F_2` has lower bond dissociation enthalpy than `Cl_2.` Why?

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Due to smaller size, the lone pairs of electrons on the F-atoms repel the bond pair of the F-F bond. In contrast, because of comparatively large size of CI atoms, the lone pairs on the CI atoms do not repel the bond pair of CI-CI bond. As a rsult, F-F bond energy is lower than that of CI-CI bond energy.
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PRADEEP-P-BLOCK ELEMENTS -CONCEPTUAL QUESTION
  1. Electron gain enthalpies of halogens are largely negative. Explain.

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  2. The negative value of electron gain enthalpy is less for fluorine than...

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  3. F2 has lower bond dissociation enthalpy than Cl2. Why?

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  4. I(2) is more soluble in KI than in water. Why ?

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  5. Why fluorine does not exhibit any positive oxidation state?

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  6. Fluoride ion has higher hydration enthalpy than chloride ion. Give rea...

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  7. Among halogens, F(2) is the strongest oxidising agent. Or F(2) is a ...

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  8. F(2) is a stronger oxidising agent than Cl(2)

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  9. Addition of Cl(2) to KI solution gives it a brown colour but excess of...

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  10. Give chemical reaction in support of the observation that iodide ions ...

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  11. Arrange the following in the decreasing order of their boiling points ...

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  12. (i) Hydrogen fluoride is a weaker acid than hydrogen chloride in aqueo...

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  13. Complete the following reaction equation : NaClO(3) (aq) + SO(2)(g) ra...

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  14. More metal fluorides are ionic in nature than metal chlorides. Assign ...

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  15. Why HF acid is stored in wax coated glass bottle ?

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  16. Name the gas evolved when concentrated HCI is added to powdered potass...

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  17. Complete the following reaction equation : Ca(OCl)(2) + HCl.

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  18. Explain bleaching action of chlorine. Or Cl(2) acts as a bleaching a...

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  19. What happen when Cl(2) is passed through a hot concentrated solution o...

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  20. Arrange HClO, HBrO, HIO decreasing order of acidic strength.

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