Manganese(IV) oxide is added to hydrogen peroxide solution. The hydrogen peroxide decomposes more quickly. The mass of manganese(IV) oxide is the same at the end. What is the manganese(IV) oxide acting as?
A catalyst, because it speeds up the reaction and is not used up
A reactant, because it is used up as the reaction takes place
A product, because it is made as the reaction takes place
A solvent, because it dissolves the hydrogen peroxide in water
91 exam-style questions on AQA GCSE Chemistry 1.3 Properties of transition metals, covering 1.3.1 Comparison with Group 1 elements and 1.3.2 Typical properties of transition metals. Each one has a worked solution and a mark scheme showing where the marks go.