Question

Select the element in the following which does not show oxidation state $+4$ :

• A. $Ti$
• B. $Zr$
• C. $La$
• D. $Pt$

Answer 1

Answer: (C)

Lanthanum is a $d-$ block element but its properties are similar to lanthanides.
La does not show $+4$ oxidation state. It shows only $+3$ oxidation state by losing two $6s$ and one $5d$ electron.