Question

Compounds of which of the following transition elements do not exhibit an oxidation state of +3?

• A. Ti
• B. Zr
• C. Cu
• D. None

Answer 1

Answer: (A), (B), (C)

The correct options are
A Ti
B Zr
C Cu

Highest Oxidation State for a Transition metal = Number of Unpaired d-electrons + Two s-orbital electrons

$Ti$ Titanium atomic number $22=\left[Ar\right]4s^{2}3d^2$. Oxidation state $=+4$

$Zr$ Zirconium atomic number $40=\left[Kr\right]5s^{2}4d^2$. Oxidation state $=+4$

$Cu$ Copper atomic number $29=\left[Ar\right]4s^{1}3d^{10}$. Oxidation state $=+1,+2$