In the laboratory preparation of oxygen from hydrogen peroxide – answer the following:

(a) Draw a neat and labelled diagram for the method used in above preparation.

(b) Name the catalyst used in the preparation and state its function.

(c) State the word equation for the reaction involving the above preparation of oxygen.

(d) State the method of collection of the oxygen gas giving reasons.

(a) Labelled diagram of the laboratory preparation of oxygen from hydrogen peroxide is shown below:

(b) Manganese dioxide is used as the catalyst. It alters the rate of the reaction and increases the rate of evolution of oxygen.

(c) Hydrogen peroxide ⟶ Water + oxygen

(d) Oxygen gas is collected by the downward displacement of water because:

1. Oxygen is very slightly soluble in water
2. Oxygen is almost as heavy as air hence it cannot be collected over air.