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In which of the following arrangements is the order not according to the property indicated against it?

$(A) Rb < Br < F < Cl $: Increasing electron gain enthalpy

$(B) Li < Na < K < Rb$ : Increasing metallic radius

$(C) B < C < N < O $ : Increasing first ionization energy

$(D) Al^{3+} < Mg ^{2+} < Na^{+} < F$ : Increasing ionic size

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Nitrogen has a stable configuration.
So, ionization enthalpy of nitrogen is greater than that of Oxygen, so the correct order is $(C)\; B < C < N < O $ : Increasing first ionization energy
answered Mar 16, 2014 by balaji.thirumalai

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