Question

93. In which of the following options order of
arrangement does not agree with the variation of
property indicated against it?
(a) Al3+ <Mg2+ <Na* <F (increasing ionic size)
(b) B < C <N< 0 (increasing first ionisation
enthalpy)
(c) I < Br< Cl< F (increasing electron gain
enthalpy)
(d) Li< Na<K<Rb (increasing metallic radius)
(NCERT Exemplar Problem)​

Answer 1

Answer:

B

Explanation:

in same period z-effect increases.so ionization enthalpy increses but due to half filled outer orbital of "N" their stability becomes more than that of "O" so,first ionization enthalpy of N become more than that of "O "