Suggest one reason why electron pair repulsion theory cannot be used to predict the shape of the [CoCl4]2− ion.

Suggest one reason why electron pair repulsion theory cannot be used to predict the shape of the [CoCl4]2− ion.

Predict the shape of, and the bond angle in, the complex rhodium ion [RhCl4]2−. Shape and Bond angle

An acidified solution of NH4VO3 reacts with zinc. Explain how observations from this reaction show that vanadium exists in at least two different oxidation states.

A co-ordinate bond is formed when a transition metal ion reacts with a ligand. Explain how this co-ordinate bond is formed.

Suggest one reason why a colorimetric method might be chosen in preference to titration.

Other than having variable oxidation states, explain why Fe2+ ions are good catalysts for this reaction.

Write a half-equation for the reduction of S2O82– ions to SO42– ions.

Construct an overall equation for the reaction between S2O82– ions and I– ions.

Explain why an electron transition causes a solution containing the transition metal ion to be coloured.

State three different features of transition metal complexes that cause a change in the value of ΔE, the energy change between the ground state and the excited state of the d electrons.

Explain briefly how the precipitate in the desiccator becomes dry.

State the general property of transition metals that allows the vanadium in vanadium(V) oxide to act as a catalyst in the Contact Process.

Give the meaning of the term heterogeneous.

Give one reason why impurities in the reactants can cause problems in processes that use heterogeneous catalysts.