Question

Which statement(s) concerning SOx and NOx emissions are true?

I. Automobiles produce NOx but very little SOx.
II. Power plants produce only SOx
III. Diesel powered vehicles produce only SOx
IV. The high concentration of nitrogen compounds in gasoline accounts for the formation of NOx by automobiles and trucks.

A: I only
B: I and II only
C: II and IV only
D: I, II, III, and IV

Answer 1

Only the statement that automobiles produce NOx but very little SOx is true, as power plants produce both SOx and NOx, and diesel vehicles do not produce only SOx. The formation of NOx in automobiles is due to high temperatures in engines, not high nitrogen contents in fuels.

Step-by-step explanation:

Among the statements concerning SOx and NOx emissions, the correct ones state that automobiles produce NOx but very little SOx (Statement I), while it is incorrect that power plants produce only SOx (Statement II) and that diesel powered vehicles produce only SOx (Statement III). Regarding Statement IV, it is not the high concentration of nitrogen compounds in gasoline that accounts for the formation of NOx, but rather the high temperatures in engines that cause atmospheric nitrogen to react with oxygen to form NOx.

Therefore, the true statement is:
I. Automobiles produce NOx but very little SOx.