Question

1. (a) table 1 is an incomplete table showing pollutants from the pro sulphuric acid. table 1 pollutant method used to minimise the pollutant so₂ using caco₃ (i) ……………………………… …………………………………………………… …………………………………………………… (ii) ……………………………… …………………………………………………… …………………………………………………… complete table 1 by stating the other two pollutants and the methods used to minimise them. 4 (b) (i) state the role of yeast in the fermentation of glucose 1 (ii) give one other condition necessary for the fermentation process. 1 4024/2 n2023 (iii) ethanol produced in b (i) is dilute. describe and explain how the dilute ethanol solution is concentrated

Explanation:

Step1: Identify pollutants in sulfuric - acid production

Common pollutants include particulate matter and nitrogen oxides.

Step2: Find methods to minimize particulate matter

Electrostatic precipitators can be used to remove particulate matter by charging the particles and attracting them to electrodes.

Step3: Find methods to minimize nitrogen oxides

Selective catalytic reduction (SCR) can be used to convert nitrogen oxides into nitrogen and water using a catalyst and a reducing agent like ammonia.

Step4: Role of yeast in glucose fermentation

Yeast acts as a biological catalyst (enzyme - containing microorganism) to convert glucose into ethanol and carbon - dioxide through anaerobic respiration.

Step5: Other condition for fermentation

Anaerobic conditions (absence of oxygen) are necessary as fermentation is an anaerobic process.

Step6: Concentrating dilute ethanol

Distillation is used. Ethanol has a lower boiling point ($78.4^{\circ}C$) compared to water ($100^{\circ}C$). When the dilute ethanol solution is heated, ethanol vaporizes first. The vapor is then condensed and collected, increasing the ethanol concentration.

Answer:

(a)(i) Particulate matter; Using electrostatic precipitators
(ii) Nitrogen oxides; Using selective catalytic reduction (SCR)
(b)(i) Yeast acts as a biological catalyst to convert glucose into ethanol and carbon - dioxide.
(ii) Anaerobic conditions.
(iii) Distillation is used. Ethanol has a lower boiling point than water. When heated, ethanol vaporizes first, is condensed and collected, increasing its concentration.