Nitrogen dioxide reacts with water.
2NO$_2$ + H$_2$O → HNO$_2$ + HNO$_3$
Which statement about this reaction is correct?
1 )
Both products are formed because oxygen atoms gain electrons.
Nitrogen atoms undergo disproportionation.
3 )
The oxidation number of hydrogen is increased.
4 )
Water acts as an oxidising agent.
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