Write the reaction equation: CaO – Ca (NO3) 2 – HNO3 – HO2

1. Treatment of calcium oxide with nitric acid.
CaO + 2HNO3 = Ca (NO3) 2 + H2O.
2. Obtaining nitric acid by the action of stronger sulfuric acid on calcium nitrate.
Ca (NO3) 2 + Н2SO4 = CaSO4 + 2HNO3.
3. Laboratory method for producing nitrogen oxide.
4HNO3 + Cu = Cu (NO3) 2 + 2NO2.

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