The incorrect statement is:

(a) The second ionisation energy of Se is greater than that of second ionisation energy of As 

(b) The first ionisation energy of C2+ ion is greater than that of first ionisation energy of N2+ ion

(c) The third ionisation energy of F is greater than that of third ionisation energy of O

(d) Helogens have highest I.E. in respective period

Concept Videos :-

#8 | Ionisation Enthalpy: Introduction
#9 | Calculation of Ionisation Enthalpy
#10 | Factors affecting Ionisation Enthalpy
#11 | Trends in Ionisation Enthalpy
#12 | Application of Ionisation Enthalpy
#13 | Solved Problems

Concept Questions :-

Ionization Energy (IE)
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