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

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

NTA AbhyasNTA Abhyas 2022

Solution:

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.