d and f BLOCK ELEMENTS MCQ Quiz: GKFix - Bridge of Knowledge - Page 132

Question 656

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Do La³⁺ and Lu³⁺ ions show color?

Yes, they are strongly colored
Sometimes, depending on the compound
No, they do not show any color
Only La³⁺ is colorless

Question 657

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Why are many trivalent lanthanoid ions colored in the solid state and aqueous solutions?

Presence of d electrons
Presence of s electrons
Presence of f electrons
Presence of p electrons

Question 658

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What is generally observed about the density and other properties of lanthanoids across the series?

They change erratically
They remain constant
They change smoothly
They fluctuate randomly

Question 659

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How do lanthanoids conduct heat and electricity?

They are poor conductors
They are good conductors
They are insulators
They are semiconductors

Question 660

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What is the crystal structure of lanthanoids?

Ionic crystal structure
Covalent network structure
Typical metallic structure
Molecular crystal structure