MC test: First-row d-block elements

Multiple choice test on 13.1 First-row d-block elements

Use the following 'quiz' to test your knowledge and understanding of this sub-topic. You will need access to a periodic table (Section 6 of the IB data booklet).

If you get an answer wrong, read through the explanation carefully to learn from your mistakes.

Which statements are true about copper compounds?

I. Solid copper(I) sulfate is white.

II. The [Cu(H2O)6]2+ ion has an octahedral shape.

III. The Cu2+ ion in Cu2+(aq) is paramagnetic.

The copper(I) ion has a completely filled d sub level so does not form coloured compounds. The Cu2+ ion has the electron configuration [Ar]3d9 so must be paramagnetic as it contains an unpaired electron.

 

What is the electron configuration of the Mn2+ ion?

Mn (Z = 25)  has the electron configuration [Ar]4s23d5. It loses the two 4s electrons when it forms the Mn2+ ion.

 

Which are typical properties of transition metals?

I. They are good catalysts.

II. They are strongly magnetic.

III. They have variable oxidation states.

Only iron (and to some extent cobalt and nickel) are strongly magnetic. The others show paramagnetism or diamagnetism.

 

Which complex ion is paramagnetic?

 

Which cannot function as a ligand?

A ligand is a small molecule or anion that contains at least one non-bonding pair of electrons. Methane has no non-bonding pair of electrons.

 

What is the value for x in iron(III) hexacyanide, [Fe(CN)6]x?

Iron is the 3+ ion, the six CN− ions together give 6−, so the total is 3−. 

 

Copper can form a complex ion with EDTA4−. It has the structure:

Which statement best describes this ion?

There is only one ligand but it forms six coordinate bonds using six non-bonding pairs so it is hexadentate.

 

When the total charge is added to complete the formulas, which complex ion does not have a total charge of 2+?

All the metal ions have a charge of 2+. The only ligand that is not neutral is Cl−, so [CuCl4] will have a total charge of 2−.

 

Which electrons are lost when chromium metal forms the Cr3+ ion?

Cr has the electron configuration [Ar]4s13d5 and Cr3+ has the electron configuration [Ar]3d3.

 

Which statements about ligands are correct?

I. They act as Lewis bases.

II. Polydentate ligands contain more than one non-bonding pair of electrons.

III. They may be neutral molecules or negative ions.

Lewis bases donate a pair of electrons, polydentate ligands form more than one coordinate bond to transition metals (as they contain more than one non-bonding pair of electrons) and water and cyanide ions are examples of neutral and anionic ligands respectively.

 

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