Which of the following order of arrangement agree with the variation of property indicated against it.
(I) 
(Increasing ionic size)
(II) 
(Increasing 
ionisation enthalpy)
(III) I 
(Increasing electron gain enthalpy)
(IV) 
(Increasing metallic radius)
(V) 
(Increasing 
ionisation enthalpy)
Choose the correct answer from the following option.
Text Solution
Verified by ExpertsA
Among the given order I and IV are correct while rest are incorrect.
The first I.E increases from left to right. However, due to greater stability of the half-filled electronic configuration of nitrogen, its ionisation enthalpy is higher than that of oxygen.
Thus, the order is 
.
The metallic character increases as the size of the metal atom increases. However, due to stronger electron-electron repulsion in the small size of fluorine the negative electron gain enthalpy of fluorine is lower than that of chlorine.
Thus, the order is 
.
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