Answer :
Final answer:
Nitrous acid, HNO2, is an unstable weak acid that exists only in solution and plays a significant role in various industrial processes.
Explanation:
Nitrous acid, HNO2, is the name for an aqueous solution of HNO2. It is known for being a weak acid and important reagent used in the production of hydroxylamine and for diazotidation processes in the manufacturing of products like azo dyes and drugs.
Nitrous acid exists only in solution and is very unstable, disproportionating slowly into nitric acid and nitric oxide. It is also an active oxidizing agent with strong reducing agents.
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