A) The average residence time of NO is one month
B) Limestone acts as a sink for \[S{{O}_{x}}\]
C) \[S{{O}_{x}}\] can be removed from flue gases by passing through a solution of citrate ions
D) Ammonia acts as a sink for \[N{{O}_{x}}\]
Correct Answer: A
Solution :
The average residence time of NO is 4 days.
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