In which of the following arrangements has order is NOT according to the property indicated against it?
In which of the following arrangements has order is NOT according to the property indicated against it?
A. `AI^(3+) lt Mg^(2+) lt Na^(+) lt F^-)`-increasing ionic size
B. `B lt C lt F lt O`-increasing first ionisation enthalpy
C. `I lt Br lt F lt CI`-increasing electron gain enthalpy (with negative sign)
D. `Li lt Na lt K lt Rb-`increasing metallic radius
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Correct Answer - B
Nitrogen has half filled stable configuration, `ns^(2)np^(3)`. So, ionization enthalpy of nitrogen is greater than oxygen. On moving down the group, metallic radius increases due to increases in number of shells.
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