JEE CHEMISTRY MCQ: d & f- BLOCK ELEMENTS

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Zr (z=40) and Hf (z=72) have similar atomic radii because of

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Correct option: D

Lanthanoid contraction

Option D (Lanthanoid contraction) is correct because the lanthanoid contraction causes the atomic radii of Zr and Hf to be very similar due to the poor shielding of the 4f electrons.

More Questions from d & f- BLOCK ELEMENTS

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Mercury is transported in metal containers made of: Cadmipone is a mixture of: The number of element from the following that do not belong to lanthanoids is :
Eu, Cm, Er, Tb, Yb and Lu Statement-I:

{Sm}^{3+}

{Dy}^{3+}

have same colour (yellow).

Statement-II: Both ions are having same number of unpaired electrons. The most common oxidation state of Lanthanoid
elements is +3. Which of the following is likely to
also form other oxidation state? A mixture of

\mathrm{Ti}{\mathrm{O}_2}

and

\mathrm{BaS}{\mathrm{O}_4}

is called