a) Ammonia b) Sulfur c) Organic matter d) Calcium Which of the following is an e
ID: 288065 • Letter: A
Question
a) Ammonia b) Sulfur c) Organic matter d) Calcium Which of the following is an end product formed from both the aerobic and an organic matters? 6. a) NO3 b) CHA c) H2S d) CO2 7· The nitrogenous oxygen demand begins after how many days? a) 1 b) 2 c) 3 d) 5 The water that could be extracted from a 2 m3 volume of a saturated aquifer of grav characteristics given in Table 5.11) is: a) 0.32 m3 b) 0.44 m3 c) 0.40 m3 d) 0.50 m3 8. The presence of nitrates in water in excess of 50 ppm may cause: a) Methemoglobinemia (blue baby syndrome) b) Tooth decay c) Gastrointestinal d) Cryptosporidium 9. 10. The pH of a solution containing 5.66 × 10-7 mol/L of H + is: a) 5.25 b) 6.25 c) 7.00 d) 12.66 11. Which of the following promotes eutrophication of lakes? a) Magnesium b) Phosphorous c) Sodium d) LeadExplanation / Answer
6) ANSWER is: D
EXPLANATION :
C02 is the end product formed from both aerobic and anaerobic organic matter
Under aerobic conditions the end-products are carbon dioxide and water in which carbon emitted as carbon dioxide.
Under anaerobic conditions, carbon dioxide is formed as a by-product by decomposition reactions that has complex organic compounds having oxygen.
7) The nitrogenous oxygen compound begins after 6 days. The nitrogenous stage which is second stage defines as combined carbonaceous and nitrogeneous demand, when organic nitrogen, ammonia, and nitrite are converted to nitrate. Nitrogenous oxygen demand begins after about 6 days
9) The presence of nitrates in water excrss of 50ppm causes methemoglobinemia. When nitrate level in drinking water exceeds 50 ppm then the main source is total nitrate intake. The presence of nitrate shows an old contamination provided nitrites are absent.
Excess concentration of nitrate causes methemoglobinemia . As oxygen transport depends on the maintenance of intra cellular hemoglobin in the reduced (Fe2+) state. When hemoglobin is oxidized to methemoglobin, then heme iron becomes (Fe3+) which shows it is incapable of binding oxygen.
11) Answer: Phosphorous
Phosphorous promotes the eutrophication of lakes because it is helpful for the growth of plants in lakes and can easily reach the lakes through industrial water.
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