Which of the following is false

Options

A. `Cr^(2+)(g)` ion has greater magnetic moment compared to `Co^(3+(g)`.
B. The magnitude of ionization potential of iron anion (monoanion) would be equal to electron gain enthalpy of iron
C. lanthanide contraction is cause of lower I.P. of Pb than Sn.
D. If successive ionization energy are 332, 738, 849, 4080, 4958 (in KJ/mol). Then this element can be of 15th group.

Answer

A, C, D

Explanation

[Atomic size of `k gt k^(+) F lt F^(-)`]