d and f BLOCK ELEMENTS MCQ Quiz: GKFix - Bridge of Knowledge - Page 244

Question 1216

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What is the primary cause of paramagnetism in substances?

Paired electrons
Nuclear spin
Presence of unpaired electrons
Molecular vibrations

Question 1217

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What type of magnetism is characterized by substances being attracted very strongly by a magnetic field?

Diamagnetism
Paramagnetism
Ferromagnetism
Antiferromagnetism

Question 1218

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Why is the density of transition metals generally high?

They are all solids
They have high melting points
They form metallic bonds
High atomic masses combined with relatively small atomic radii

Question 1219

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What is the primary reason for the decrease in atomic radii across the first transition series (Sc to Zn)?

The electrons are lost from the 4s orbital
The 3d electrons are lost first
The increasing number of protons outweighs the electron addition
The increasing nuclear charge is not fully shielded by the added 3d electrons

Question 1220

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Why do transition metal ions frequently exhibit paramagnetism?

They have high atomic masses
They form complex ions
They have high melting points
They often possess unpaired electrons in their d orbitals