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Which of the following complexes has a coordination number of 6?

• [Co(NH₃)₆]³⁺

• MnO₄^-

• [CuCl₄]^2-

• [Ag(NH₃)₂]⁺

Which of the following is a necessary feature of all ligands?

• a negative charge

• an electronegative atom

• the presence of a non-bonding pair of electrons

• the presence of two or more atoms

Why do transition metals make effective heterogeneous catalysts?

• they have the ability to form weak bonds with reactant molecules

• they provide a surface for reactant molecules to come together with the correct orientation

• they have the ability to show variable oxidation states

• they are good conductors of heat and electricity

Which of the following elements would be expected to be paramagnetic?

• Ca

• Zn

• He

• Mn

Which of these elements is most paramagnetic?

• Sc

• Ti

• V

• Cr

Which of the following best explains why [Fe(H₂O)₆]³⁺ and [Fe(H₂O)₆]²⁺ are different colors?

• The ligands have a different charge density

• The nuclear charge of the metals is different

• The number of d electrons present on each of the metals

• The geometry of the complex ion

Which block on this periodic table represents the transition metals?

• s block

• d block

• p block

• f block

Which of the following is not a transition metals?

• sodium

• chromium

• iron

• nickel

When compared to group 1 metals, the transition metals are...

• harder

• softer

When compared to group 1 metals, the transition metals have...

• higher melting points

• lower melting points