The d-and f-Block Elements Quiz-2

Question 1

The +3 ion of which one of the following has half-filled 4f subshell?

Accepted Answer

Gd

Answer

La

Answer

Lu

Answer

Ac

Question 2

Arrange $Ce^{3+}, La^{3+}, Pm^{3+}$ and $Yb^{3+}$ in increasing order of their ionic radii

Accepted Answer

$Yb^{3+} $ < $Pm^{3+}$ < $Ce^{3+}$ < $La^{3+}$

Answer

$Ce^{3+}$ < $Yb^{3+}$ < $Pm^{3+}$ < $La^{3+}$

Answer

$Yb^{3+} $< $Pm^{3+}$ <$ La^{3+}$ < $Ce^{3+}$

Answer

$Pm^{3+} $< $La^{3+}$ < $Ce^{3+}$ < $Yb^{3+}$

Question 3

Four successive members of the first-row transition elements are listed below with their atomic numbers. Which one of them is expected to have the highest third ionisation enthalpy?

Accepted Answer

Manganese (Z = 25)

Answer

Vanadium (Z = 23)

Answer

Chromium (Z = 24)

Answer

Iron (Z = 26)

Question 4

The aqueous solution containing which one of the following ions will be colourless? (Atomic number: Sc = 21, Fe = 26, Ti = 22, Mn = 25)

Accepted Answer

$Sc^{3+}$

Answer

$Fe^{2+}$

Answer

$Ti^{3+}$

Answer

$Mn^{2+}$

Question 5

Which one of the following elements with the following outer orbital configuration may exhibit the largest number of oxidation states?

Accepted Answer

$3d^54s^2$

Answer

$3d^24s^2$

Answer

$3d^34s^2$

Answer

$3d^54d^1$

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The d-and f-Block Elements Quiz-2

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