Question

Intext Questions
7.26 Considering the parameters such as bond dissociation enthalpy, electron
gain enthalpy and hydration enthalpy, compare the oxidising power of
F2 and Cl.
7.27 Give two examples to show the anomalous behaviour of fluorine.
7.28 Sea is the greatest source of some halogens. Comment.


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Answer 1

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Answer 2

Answer:

7.26 Fluorine is a much stronger oxidizing agent than chlorine. The oxidizing power depends on three factors.

1. Bond dissociation energy

2. Electron gain enthalpy

3. Hydration enthalpy

The electron gain enthalpy of chlorine is more negative than that of fluorine. However, the bond dissociation energy of fluorine is much lesser than that of chlorine. Also, because of its small size, the hydration energy of fluorine is much higher than that of chlorine. Therefore, the latter two factors more than compensate for the less negative electron gain enthalpy of fluorine. Thus, fluorine is a much stronger oxidizing agent than chlorine.

7.27. (i) It forms only one oxoacid as compared to other halogens that form a number of oxoacids. (ii) Ionisation enthalpy, electronegativity, and electrode potential of fluorine are much higher than expected.

7.28. Seawater contains chlorides, bromides, and iodides of Na, K, Mg, and Ca. However, it primarily contains NaCl. The deposits of dried up sea beds contain sodium chloride and carnallite, KCl.MgCl6HO

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Marine life also contains iodine in their systems. For example, seaweeds contain up to 0.5% iodine as sodium iodide. Thus, the sea is the greatest source of halogens.