d and f BLOCK ELEMENTS

What is the primary factor that makes transition metals good reflectors of light (metallic lustre)?

• Their smooth surface finish.
• Their high density.
• Their ionic nature.
• The interaction of light with the mobile electrons in the conduction band.

Based on the lattice structure table, which series shows the most diversity in crystal structures (bcc, hcp, ccp, X) within its first five elements?

• 3d series
• 4d series
• 5d series
• Lanthanide series

How does the presence of unpaired d electrons in transition metals generally affect their magnetic properties?

• Unpaired electrons cause diamagnetism.
• They have no effect on magnetic properties.
• They always cause ferromagnetism regardless of arrangement.
• Unpaired electrons contribute to paramagnetism or ferromagnetism.

Which of the following elements is explicitly mentioned as having a typical metallic structure at normal temperatures?

• Mercury
• Cadmium
• Zinc
• Iron

What is the significance of the maxima observed in the enthalpies of atomisation (Fig. 4.2) for transition metals?

• It shows bonding is weakest at the series' midpoint.
• It indicates complete filling of d orbitals gives maximum bonding.
• It signifies that s electrons alone determine bonding strength.
• It indicates optimal bonding strength occurs when d orbitals are half-filled with one electron each.