Write balanced equations and name the products formed when:

(a) Sodium hydrogen carbonate is added to nitric acid.

(b) Cupric oxide reacts with nitric acid

(c) Zinc reacts with dilute nitric acid

(d) Concentrated nitric acid is heated

(a) Sodium hydrogen carbonate when treated with nitric acid forms sodium nitrate, carbon dioxide and water.

NaHCO₃ + HNO₃ ⟶ NaNO₃ + H₂O + CO₂ ↑

(b) Cupric oxide reacts with dilute nitric acid, it forms copper nitrate and water.

CuO + 2HNO₃ ⟶ Cu(NO₃)₂ + H₂O

(c) Zinc reacts with dil. nitric acid to form zinc nitrate, nitric oxide and water

3Zn + 8HNO₃ ⟶ 3Zn(NO₃)₂ + 4H₂O + 2NO

(d) When concentrated nitric acid is heated it forms nitrogen dioxide gas, water and oxygen gas

4HNO₃ $\xrightarrow{\Delta}$ 4NO₂ + 2H₂O + O₂