A) Oxidising agent
B) Reducing agent
C) Both a and b
D) Its solution is stable
Correct Answer: C
Solution :
Nitrous acid behaves as reducing as well as an oxidising agent. It reduces potassium permanganate, potassium dichromate, \[{{H}_{2}}{{O}_{2}}\] and other strong oxidising agents. It oxidises strong reducing agents such as hydroiodic acid, sulphurous acid etc. It oxidises \[F{{e}^{+2}}\] into \[F{{e}^{+3}}\] in acidic medium; \[F{{e}^{+2}}+HN{{O}_{2}}+{{H}^{+}}\,\to \,F{{e}^{+3}}+NO+{{H}_{2}}O\] It reduces acidified \[KMn{{O}_{4}}\]. \[2KMn{{O}_{4}}+3{{H}_{2}}S{{O}_{4}}+5HN{{O}_{2}}\,\to \]\[{{K}_{2}}S{{O}_{4}}+2MnS{{O}_{4}}+3{{H}_{2}}O+5HN{{O}_{3}}\]
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