"A" obtained by Ostwald's method involving air oxidation of , upon further air oxidation produces "B". "B" on hydration forms an oxoacid of nitrogen along with evolution of "A". The oxoacid also produces "A" and gives a positive brown ring test.
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Correct answer:C
Standard Method
Given: "A" is obtained in the Ostwald process from air oxidation of . On further oxidation, A gives B. On hydration, B forms an oxoacid of nitrogen along with evolution of A.
Find: The identities of A and B.
In the Ostwald process, ammonia is oxidized to nitric oxide:
So, A = .
Further oxidation of nitric oxide gives nitrogen dioxide:
So, B = .
On hydration, nitrogen dioxide forms nitric acid along with nitric oxide:
The oxoacid formed is nitric acid, which is associated with the brown ring test.
Therefore, the pair is and the correct option is C.
Discrepancy noted: the solution states "The Correct Option is A", but the worked chemistry and final answer line clearly identify , which corresponds to option C.
Confusing the first product of the Ostwald process with . This is wrong because ammonia is first oxidized to , and only then undergoes further oxidation. Start with the industrial process sequence correctly.
Assuming hydration of gives only one oxide or only one acid product. This is wrong because the given reaction produces nitric acid along with evolution of . Use the reaction .
Linking the brown ring test to the wrong nitrogen oxide instead of the oxoacid formed. This is wrong because the test is used for nitrate-containing species, supporting identification of nitric acid. First identify the acid formed after hydration, then use the test clue.
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