d and f BLOCK ELEMENTS

What is the typical colour of a Cu2+ aqueous solution?

• Red
• Green
• Blue
• Yellow

What is the typical colour of a Ni2+ aqueous solution?

• Blue
• Red
• Green
• Colourless

What is the typical colour of a Cr3+ aqueous solution?

• Yellow
• Blue
• Green
• Colourless

In the first transition series, how does the stability of the +2 oxidation state generally change from left to right?

• It remains constant.
• It generally increases.
• It generally decreases.
• It fluctuates randomly.

What is the main reason for the variable oxidation states commonly observed in transition metals?

• They have a large number of protons.
• They have a large number of electrons.
• They are highly electronegative.
• The energy levels of ns, (n-1)d, and sometimes (n-2)f orbitals are relatively close.