d and f BLOCK ELEMENTS MCQ Quiz: GKFix - Bridge of Knowledge

Question 51

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Which of the following 3d transition metal ions would you expect to be most likely diamagnetic in an octahedral complex with weak field ligands?

Ti^2+
Cr^3+
Zn^2+
Mn^2+

Question 52

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What is the ground state electronic configuration of Copper (Cu, Z=29), and why is it an exception to the expected Aufbau principle?

[Ar] 3d^9 4s^2; It follows the Aufbau principle.
[Ar] 3d^11; It has an extra electron in the d-subshell.
[Ar] 3d^10 4s^1; A completely filled 3d subshell (d^10) is more stable than the expected [Ar] 3d^9 4s^2 configuration.
[Ar] 4s^2 4p^7; It fills the p-orbital instead.

Question 53

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What is the ground state electronic configuration of Chromium (Cr, Z=24), and why is it an exception to the expected Aufbau principle?

[Ar] 3d^4 4s^2; It follows the Aufbau principle.
[Ar] 3d^6; It has a filled 3d subshell.
[Ar] 3d^5 4s^1; A half-filled 3d subshell (d^5) is more stable than the expected [Ar] 3d^4 4s^2 configuration.
[Ar] 4s^2 4p^4; It fills the p-orbital instead.

Question 54

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Why is the third ionization enthalpy of transition metals not necessarily highest for the element with the most protons in the first transition series?

Because atomic size decreases across the series.
Because ionization enthalpies depend significantly on the stability of the electronic configuration of the ion formed, particularly half-filled or fully filled subshells.
Because all transition metals have similar properties.
Because the first transition series elements are metals.

Question 55

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What can be inferred about the magnetic moment of K2[MnCl4] having a value of 5.9 BM?

It indicates one unpaired electron, a low-spin configuration.
It indicates five unpaired electrons, confirming the high-spin d^5 configuration for Mn(II) in a tetrahedral field.
It indicates three unpaired electrons.
It indicates the complex is diamagnetic.

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