Which of the following represents the incoorect order of the properties indicated?

Options

A. `Ni^(2+)gtCr^(2+)gtFe^(2+)gtMn^(2+)` (size)
B. `ScgttIgtCrgtMn` (size)
C. `Ni^(2+)ltCo^(2+)ltFe^(2+)ltMn^(2+)` (unpaired electron)
D. `H_3AsO_4gtH_3PO_4` (acidic strength order)

Answer

a,d

Explanation

(a). Same order for neutral atom and ion having same charge. (a) and (d) are incorrect.
`overset(ScgtTigtVgtCrgtMn)to`
Therefore `Cr^(2+)gtMn^(2+)gtFe^(2+)gtCo^(2+)gtNi^(2+)`
(d). `H_2AsO_4ltH_2PO_4` as P is more electronegative than As.