Question

Which of the following metals does not exhibit variable oxidation state?

• A. $Cu$
• B. $Sc$
• C. $V$
• D. $Cr$

Answer 1

The correct option is B $Sc$

$Sc$ doesn't show variable oxidation state. It only exhibit $+3$ oxidation state.
$Cu$ can show $+1,+2$ oxidation state.
$V$ can show $+2,+3,+4,+5$ oxidation state.
$Cr$ can show $+2,+3,+4,+5,+6$ oxidation state.