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JEE CHEMISTRY MCQ: d & f- BLOCK ELEMENTS

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When hydrogen peroxide is added to acidified potassium dichromate, a blue colour is produced due to formation of

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Correct option: C

\mathrm{Cr}{\mathrm{O}_5}

Option C (

\mathrm{Cr}{\mathrm{O}_5}

) is correct because hydrogen peroxide oxidizes acidified potassium dichromate to form unstable blue chromium peroxide (

\mathrm{Cr}{\mathrm{O}_5}

).

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}

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