Question

Name the oxometal anions of the first series of the transition metals in which the metal exhibits the oxidation state equal to its group number.

Answer 1

MnO₄^- (permanganate ion) : Oxidation state of Mn = +7 (Group No = 7)

CrO₄^2- (chromate ion) : Oxidation state of Cr = +6 (Group No = 6)

Note: i. +8 oxidation state is shown by both Os and Rh. However, Os in OsO₄ has the most stable oxidation state.

ii. Atoms having high electronegativity such as O or F stabilize higher oxidation states. However, ligands which have the ability to accept electrons from the metal (such as CO) through π bonding stabilize lower oxidation states (zero or +1).

iii. Fe³⁺ has higher oxidizing power than Fe²⁺.