Which of the following statements is incorrect?
- A$La(OH)_3$ is less basic than $Lu(OH)_3$.
- BIn the lanthanoid series,the ionic radius decreases from $Ce^{3+}$ to $Lu^{3+}$.
- CLanthanum is actually a transition element.
- DDue to lanthanoid contraction,the atomic radii of $Zr$ and $Hf$ are similar.
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Similar Questions
What is the effect of lanthanoid contraction in the lanthanoid series of elements with increasing atomic number?
Which is the correct order of ionic sizes $(At. \, No. : Ce = 58, Sn = 50, Yb = 70, Lu = 71)$?
MediumAIEEE 2002
View SolutionIdentify the correct statements about lanthanoids:
$I$. $Ce^{4+}$ and $Tb^{4+}$ act as oxidising agents.
$II$. $Eu^{2+}$ and $Yb^{2+}$ act as reducing agents.
$III$. Mischmetal is an alloy of $95 \%$ lanthanoid metal and $5 \%$ iron.
$IV$. $La^{3+}$ and $Ce^{4+}$ are diamagnetic in nature.
$I$. $Ce^{4+}$ and $Tb^{4+}$ act as oxidising agents.
$II$. $Eu^{2+}$ and $Yb^{2+}$ act as reducing agents.
$III$. Mischmetal is an alloy of $95 \%$ lanthanoid metal and $5 \%$ iron.
$IV$. $La^{3+}$ and $Ce^{4+}$ are diamagnetic in nature.
Which among the following properties of lanthanoids is $NOT$ true?
Which of the following lanthanoid elements exhibits $+2$ and $+3$ oxidation states?
Medium
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