Transition Elements Quiz

In one experiment, 45.0 cm3 of 0.2 mol dm-3 aqueous M2+ solution has reacted with 15.0 cm3 of 0.1 mol dm-3 aqueous potassium dichromate(Vl) solution. What is the oxidation state of M after the reaction?

• A +3

• B +4

• C +5

• D +7

Which of the following statements is true of complex ion [Fe(C2O4)3]3-?

• A 1 only

• B 1 and 2 only

• C 2 and 3 only

• D 1, 2 and 3

Which of the following is the most accurate definition of transition elements?

• A Elements with variable oxidation states

• B Elements with high melting and boiling points

• C Elements with ability to form coloured compounds

• D Elements with partially filled d orbitals at zero or normal oxidation states

A graph of the relative intensity of the colour of the complex formed against the volume of ligand L is given below. Ligand L is

• A Cl–

• B EDTA4–

• C NH3

• D H2NCH2CH2NH2

What are the correct oxidation states of iron in the following complex ions?

• A +2 +2

• B +2 +3

• C +3 +2

• D +3 +3

Which of the following statements is/are true of X?

• A 1 only

• B 1 and 2 only

• C 2 and 3 only

• D 1, 2 and 3

Which statement explains the observation?

• A A soluble ZnCl2 compound is formed.

• B NH3 molecule is a stronger ligand than OH–.

• C NH4+ ions increase the solubility product of Zn(OH)2.

• D NH4+ ions decrease the concentration of OH– ions in the solution.

Which reagent when added in excess to an aqueous solution containing copper(II) ions will produce a dark blue solution as the final product?

• A Aqueous ammonia

• B Aqueous potassium iodide

• C Aqueous sodium hydroxide

• D Aqueous potassium hexacyanoferrate(II)

Which complex ion(s) is/are of octahedral shape?

• A 1 only

• B 1 and 2 only

• C 2 and 3 only

• D 1, 2 and 3

Which statement about transition elements is true?

• A All the ions of the transition elements have an oxidation state of +1 to +7.

• B All transition elements form coloured compounds.

• C Cr3+ and Mn2+ ions are stable in their aqueous solution.

• D The stability of complex compounds do not depend on their ligands.