Question

1. Which of the following statements is true? Please indicate all true statements as there are multiple, and explain why. a) Non-precursors refer to molecules which do not absorb visible light from the sun.

b) CO emissions are highest when the A/F ratio is close to the stoichiometric ratio.

c) Lean A/F ratios decrease NO emissions.

d) Ozone concentrations are typically higher in the summer than winter.

e) Carbon monoxide levels typically would be higher during the morning hours in winter than during the mid afternoon hours in summer.

f) Most of the NOx produced by vehicles comes from oxidation of N in gasoline.

g) There are no longer any places in the nation that are non-attainment with respect to CO and NO2 NAAQS.

h) Two stroke engines produce more unburned hydrocarbons than four stroke engines.

i) PM10 means particles that are larger than 10 µm in diameter.

j) High carbon monoxide levels are one of the primary causes of poor visibility.

k) Ozone concentrations would be expected to peak before NO2 concentrations peak.

Answer 1

ANSWER:

Pls find below attached images for clear explanation .

a) In Photo synthesis a Precursor molecule only obsorb light from sun and forms Chioro Phyll. so non- Precursor molecule does not absorb the light from sun. So the statement is (True) : b) Co emmisions are instigate a reduction in co levels when Alf ratio is close to the Stoichiometric ratio so the Statement is (FALSE). J Lean ALF ratio mixtures are more efficient but may call se higheer temparature and lead to formation of "No." So Lean Alf Ratios Increases the No Emission; so the Statement is (FALSE). d weather conditions Play an important in ozone concentrations warm & dry weather is more condective to ozone formation then cool wet weather. so ozone concentrations are typically higher in summer season than winter season. so the Statement is Truel.

c) Carbon monoxide (lo) is a whaket absorber of I.R radiation. So any temparature Elevation due to I.R. sasiation would be small. co concentrations sont depends on True) So temparature. the Statement is to So winter season co conentrations more f) when gasoline full burns the Impurities in gasoline like Nitrogen reacts with oxygen and forms nox. so most of the Nox Produced by vehicles comes from oxidation of "N" in gasoline. so the Statement is (True). g we can attainment co upto Shours up to 9 ppm once per year.. as No, we can attained 1 hour daily cep to 100 Ppb. so we can attain with respect to co and NO₂ As per NAAQS. So the statement is (FALSE) A Two Stroke engines are produces more unburned hydrocarbon than 4 Stroke engines a In two Stroke engines Complete combustion

of fuel not happen, where as an four stroke engines complete combustion of feel happen, so it will reduce the pollution. so The Statement is (True). i PM is the particulate matter. PM 10 means particulate matter loflm (or] less in diameter. so the statement PM10 = darger than 10lm is (FALSE) statement. ; HIGH Carbon monoxide levels are one of the Primary cause of poor visibility. co, Sog gages are responsible for poor visibility. So the statement is (Truel R ozone concentration to peate peak before Peak. The Statement is would be expected No, concentrations