Question

Write a balanced equation for each of the following reactions.

1)When carbonate salts dissolve in water, they produce basic solutions.

Write a balanced net ionic equation for each of the following reactions.

1)Dilute nitric acid reacts with zinc metal with formation of nitrous oxide.

2)Concentrated nitric acid reacts with sulfur with formation of nitrogen dioxide.

3)Concentrated nitric acid oxidizes sulfur dioxide with formation of nitric oxide.

4)Hydrazine is burned in excess fluorine gas, forming NF3.

5)Hydrazine reduces CrO2−4 to Cr (OH) −4 in base (hydrazine is oxidized to N2).

Answer 1

(1)

CO₃^2-(aq)  + H₂O(l) HCO₃^-(aq) + OH^-(aq)

Carbonate ions on hydrolysis produces OH^- and solution becomes basic in nature.

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(1) 4 Zn(s) + 10H⁺(aq) + 2 NO₃^-(aq)   4 Zn²⁺(aq) + N₂O(g) + 5 H₂O(l)

(2) S(s) + 4H⁺(aq) + 6NO₃^-(aq) SO₄^2-(aq) + 6NO₂(g) + 2 H₂O(l)

(3) 3S(s) + 4 H⁺(aq) + 4 NO₃^-(aq)   3SO₂(g) + 4NO(g) + 2 H₂O(l)

(4) N₂H₄ + 5F₂ 2 NF₃ + 4 HF

(5) 3N₂H₄ +4H₂O+ 4 CrO₄^2- 3N₂ + 4Cr(OH)₄^- + 4 OH^-