Variable valency is shown by

The tendency of $3d-$ metal ions to form stable complexes is due to their

What is the number of unpaired electrons in $Ti$ in $+3$ state?

Which of the following statements are correct about $Zn, Cd$ and $Hg$?
$A$. They exhibit high enthalpy of atomization as the d-subshell is full.
$B$. $Zn$ and $Cd$ do not show variable oxidation state while $Hg$ shows $+I$ and $+II$.
$C$. Compounds of $Zn, Cd$ and $Hg$ are paramagnetic in nature.
$D$. $Zn, Cd$ and $Hg$ are called soft metals.
Choose the most appropriate from the options given below:

Which one of the following does not correctly represent the correct order of the property indicated against it?

Which of the following paramagnetic ions has a magnetic moment (spin-only) of the order of $5 \ BM$? $(Mn = 25, Cr = 24, V = 23, Ti = 22)$