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JEE CHEMISTRY MCQ: d & f- BLOCK ELEMENTS

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Remembering +4 | -1

When

{MnO}_2

is fused with potassium hydroxide in presence of

{KNO}_3

, the deep green compound obtained is

View answer and explanation

Correct option: B

{K}_2 {MnO}_4

Option B (

{K}_2 {MnO}_4

) is correct because when

MnO_2

is fused with potassium hydroxide in the presence of

KNO_3

, potassium manganate (

K_2MnO_4

), a deep green compound, is formed.

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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}