(i) Name two amorphous forms of carbon

(ii) State the reason why graphite is a lubricant but diamond is not.

(iii) Draw and label a diagram for the laboratory preparation of a dry sample of carbon (IV) oxide.

 

(b)(i) Give one example of the following: I. Soil pollutant; II. Water pollutant; III. Air pollutant.

(ii) State the major use of sulphur (IV) oxide in a chemical industry.

 

(c)(i) Explain in terms of the kinetic theory why petrol is volatile

(ii) State two criteria for determining the purity of a substance.

(iii) Mention one use of each of the following gases: I. Krypton; II. Argon

 

(d)(i) When zinc metal was added to aqueous copper (I) tetraoxosulphate (VI), the solution turned colourless. I. Name the compound in the colourless solution. II. Write the ionic equation for the reaction. Ill. State what would be observed when a few drops of sodium hydroxide solution is added to a portion of the colourless solution.

(ii) Calculate the volume of CO\(_2\) produced when 5.3g of Na\(_2\)CO\(_3\) reacted with excess HNO\(_{3(aq)}\) + Na\(_2\)CO\(_3\) + 2HNO\(_{3(aq)}\) \(\to\) 2NaNO\(_{3(aq)}\) + CO\(_{2(g)}\) + H\(_2\)O\(_{(l)}\) [H = 1, C = 12, N = 14, O = 16, Na = 23, 1 mole of a gas occupies 22.4 dm\(^3\) at s.t.p.]