d and f BLOCK ELEMENTS MCQ Quiz: GKFix - Bridge of Knowledge - Page 127

Question 631

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What electronic configurations contribute to the stability that results in abnormally low third ionization enthalpies for La, Gd, and Lu?

s² and p⁶ configurations
Empty, half-filled, and full f subshells
d⁵ and d¹⁰ configurations
s¹ and p³ configurations

Question 632

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What is the typical range of second ionization enthalpies for lanthanoids?

Approximately 600 kJ mol⁻¹
Approximately 900 kJ mol⁻¹
Approximately 1200 kJ mol⁻¹
Approximately 1500 kJ mol⁻¹

Question 633

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What is the typical range of first ionization enthalpies for lanthanoids?

Approximately 400 kJ mol⁻¹
Approximately 600 kJ mol⁻¹
Approximately 800 kJ mol⁻¹
Approximately 1000 kJ mol⁻¹

Question 634

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Why are La³⁺ and Lu³⁺ ions colorless?

They lack d electrons
They are too large
They have empty or full f subshells
They only absorb UV light

Question 635

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What is the primary reason for the color observed in many trivalent lanthanoid ions?

d-d electron transitions
f-f electron transitions
Charge transfer transitions
s-p electron transitions