(a) State one air pollution that causes: (i) blood poisoning (ii) acid poisoning (iii) blackening of the walls of buildings (b) Mention one major chemical i...

Assessment: WAEC SSCE - Chemistry - 1993 (Essay) Subject: Chemistry

Question 1 Report

(a) State one air pollution that causes:

(i) blood poisoning

(ii) acid poisoning

(iii) blackening of the walls of buildings

 

(b) Mention one major chemical industry in each case which requires the following as raw materials:

(i) petrochemicals;

(ii) cellulose.

Answer Details

(a) Air pollutant that causes:

  • (i) Blood poisoning: carbon(II) oxide (carbon monoxide, CO), which combines with haemoglobin and prevents oxygen transport. (Lead compounds also poison the blood.)
  • (ii) Acid poisoning / acid rain: sulphur(IV) oxide (SO2) (also oxides of nitrogen, NOx).
  • (iii) Blackening of the walls of buildings: carbon particles/soot (unburnt carbon from incomplete combustion).

(b) Major chemical industry using as raw material:

  • (i) Petrochemicals: the plastics/polymer (petrochemical) industry (also the synthetic fibre or synthetic rubber industry).
  • (ii) Cellulose: the paper industry (also the rayon/artificial silk or nitrocellulose industry).

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