NEET 2016 Chemistry question

In which of the following options the order of arrangement does not agree with the variation of property indicated against it?

(1) (increasing ionic size)
(2) (increasing first ionization enthalpy)Correct
(3) (increasing electron gain enthalpy)Correct
(4) (increasing metallic radius)

Answer: (2),(3)

Solution

(1) The ions are isoelectronic (10 electrons); the size decreases as the nuclear charge increases, so is correct, i.e. it agrees. (2) The first ionization enthalpy of N is higher than that of O because N has the stable half-filled configuration while

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Question ID VK-091885