NiO (s) + 2 HNO3 (aq) → Ni(NO3)2 (aq) + H2O (l)
Would you expect NiO to dissolve in an aqueous solution of NaNO3?
Figure Metal oxides reacts with acids. NiO does not dissolve in water but does react with nitric acid (HNO3) to give a green solution of Ni(NO3)2
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