The lanthanoid that does $NOT$ show $+4$ oxidation state is

Which of the following is not an actinide?

The correct statements among the following are:
$A$. $Mo(VI)$ and $W(VI)$ are less stable than $Cr(VI)$.
$B$. $Ce^{4+}$ and $Tb^{4+}$ are oxidants,while $Eu^{2+}$ and $Yb^{2+}$ are reductants.
$C$. $Cm$ and $Am$ have seven unpaired electrons.
$D$. Actinoid contraction is greater from element to element than lanthanoid contraction.
Choose the correct answer from the options given below:

Which of the following elements belongs to the inner transition elements?

Which of the following is $NOT$ a lanthanoid element?

In the lanthanide series,the basicity of the lanthanide hydroxides: