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At room temperature, disproportionation of an aqueous solution of in situ generated nitrous acid (HNO 2 ) gives the species

H 3 O + , NO 3 – and NO
H 3 O + , NO 3 – and NO 2
H 3 O + , NO – and NO 2
H 3 O + , NO 3 – and N 2 O

Correct answer: H 3 O + , NO 3 – and NO

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