CHEMISTRY · Single correct · CBSE · Chemistry · Classification of Elements and Periodicity in Properties · Classification of Elements and Periodicity in Properties
Problem
The incorrect statement is :
(1) The second ionisation energy of Se is greater than that of second ionisation energy of As
(2) The first ionisation energy of C2+ ion is greater than that of first ionisation energy of N2+ ion
(3) The third ionisation energy of F is greater than that of third ionisation energy of O
(4) Halogens have highest I.E. in respective period