Question

Which of the following transition element shows the highest oxidation state :

• A. Mn
• B. Fe
• C. V
• D. Cr

Answer 1

Answer: (A)

Mn

Answer 2

(I) [Cr(H2O)6]Cl3, x + 6(0) = +3 ; so x = +3 (II) CrO5 ,

; so x = +6

(III) K3[CrO8]3– or [Cr(O2)4]3–, here ligand is peroxo i.e. O22– ; x + 4 (–2) = –3 ; so x = +5.

(IV) (NH3)3CrO4 or [Cr(O2)2], here ligand is peroxo i.e. O22– ; x + 2 (–2) = 0 ; so x = +4.