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JEE CHEMISTRY MCQ: d & f- BLOCK ELEMENTS

1 Medium

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Remembering +4 | -1

Pure conc.

\mathrm{HN}{\mathrm{O}_3}

makes iron passive as the surface is covered with protective layer of:

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Correct option: B

\mathrm{F}{\mathrm{e}_3}{\mathrm{O}_4}

Option B (

\mathrm{F}{\mathrm{e}_3}{\mathrm{O}_4}

) is correct because concentrated nitric acid renders iron passive by forming a thin, protective layer of iron(II,III) oxide (

\mathrm{F}{\mathrm{e}_3}{\mathrm{O}_4}

) on the surface.

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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}