d and f BLOCK ELEMENTS

How many unpaired electrons are present in a gaseous V3+ ion?

• 0
• 1
• 2
• 3

How many unpaired electrons are present in a gaseous Cr3+ ion?

• 1
• 2
• 3
• 4

How many unpaired electrons are present in a gaseous Mn3+ ion?

• 2
• 3
• 4
• 5

What is the relationship between the number of unpaired electrons and the magnetic properties of transition metal ions?

• More unpaired electrons make a substance diamagnetic.
• Ions with unpaired electrons are paramagnetic, while ions with all electrons paired are diamagnetic.
• Unpaired electrons have no effect on magnetism.
• Magnetism is only related to the nucleus.

What is a key reason why transition metal ions with d0 or d10 electronic configurations are typically colourless?

• They do not form complexes.
• They absorb all wavelengths equally.
• There are no available d-d transitions possible for electronically allowed absorptions.
• They are always in aqueous solution.