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

Question 1591

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What is a notable characteristic feature of transition elements regarding their oxidation states?

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Which of the following best describes the relationship between ionization enthalpies and the stability of oxidation states in transition elements?

Ionization enthalpies provide some guidance, but the stability of oxidation states is a complex issue
Ionization enthalpies are the sole determinant of oxidation state stability
Higher ionization enthalpies always lead to more stable oxidation states
Lower ionization enthalpies always lead to less stable oxidation states

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What is the lowest common oxidation state exhibited by the first-row transition elements?

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Why is it generally difficult to achieve oxidation states higher than +2 for elements like Copper, Nickel, and Zinc?

Their high third ionization enthalpies make further ionization energetically unfavorable
They lack available 4p orbitals
They have very high electronegativity
Their atomic radii are too small

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What factor contributes most to the high third ionization enthalpies observed for d5 and d10 ions like Mn2+ and Zn2+?

The inherent stability of the half-filled (d5) and completely filled (d10) d subshells
The large size of these ions
The low nuclear charge of the parent atoms
The presence of 4s electrons