Question

27. Give reasons :

a . Electron gain enthalpy value of fluorine is less than chlorine .

b Oci , exists whereas CIO does not exist .

c Thalium has more IE than indium .​

Answer 1

a) 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. In addition, its small size, the hydration energy of fluorine is much higher than that of chlorine. So, 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

c) That's something as per the trend of periodic table, as per which, As we move down the group, the Principal Quantum Number (or shell) increases by one unit, and hence a new shell is added, such that the effect of increased nuclear charge (due to increased atomic number) is offset by the increase in atomic radius. Thus, as we go down the group, Effective Nuclear Charge decreases, atomic radius increases and hence the ionisation energy decreases. It is therefore that Ionisation Energy of Indium is less than Gallium.

Group 13 : B _ Al _ GA _ In _ Tl

Answer 2

Answer:

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