d and f BLOCK ELEMENTS

Why do substances with unpaired electrons exhibit paramagnetism?

• The paired electron spins cancel out
• They contain no electrons
• They repel the magnetic field strongly
• The unpaired electron spins align with an external magnetic field

Which of the following processes is associated with a positive E° value?

• The oxidation of Cu metal to Cu2+ ions
• The reduction of H+ ions to H2 gas
• The oxidation of Zn metal to Zn2+ ions
• The reduction of Cu2+ ions to Cu metal

What is the electronic configuration of Zn2+ that contributes to its stability and affects its E°(M2+/M) value?

• [Ar] 3d9
• [Ar] 3d8
• [Ar] 4s2
• [Ar] 3d10

What is the electronic configuration of Mn2+ that contributes to its stability and affects its E°(M2+/M) value?

• [Ar] 3d4
• [Ar] 3d6
• [Ar] 4s2
• [Ar] 3d5

Which of the following elements is described as "noble" among the first transition metals?

• Iron (Fe)
• Chromium (Cr)
• Manganese (Mn)
• Copper (Cu)