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JEE CHEMISTRY MCQ: d & f- BLOCK ELEMENTS

1 Easy

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Application +4 | -1

The +3 ion of which one of the following has half-filled

4f

sunshell?

View answer and explanation

Correct option: C

Gd

The correct answer is C (Gd) because Gd³⁺ has a half-filled 4f subshell (4f⁷).

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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}

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