JEE CHEMISTRY MCQ: d & f- BLOCK ELEMENTS

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Assertion : Zr and Hf have about the same atomic radius.

Reason: Zr and Hf lies in the same group.

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Correct option: B

If both Assertion & Reason are True but Reason is not a correct explanation of the Assertion.

Option B is correct because both the assertion and reason are true, but the reason is not the correct explanation. The lanthanide contraction is the actual reason.

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