For the following equations, determine which are redox processes. For the ones that are redox reactions, identify the oxidizing agent and r?

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2021-02-09 9:23 am

For the following equations, determine which are redox processes. For the ones that are redox reactions, identify the oxidizing agent and reducing agent.

a) 2OH–(aq) + Cr2O72–(aq) → 2CrO42–(aq) + H2O(l)

b) I2O5(s) + 5CO(g) → I2(s) + 5CO2(g)

c) PBr3(l) + 3H2O(l) → H3PO3(aq) + 3HBr(aq)

d) 2Hg2+(aq) + N2H4(aq) → 2Hg(l) + N2(g) + 4H+(aq)

回答 (1)

Uncle Michael

2021-02-09 9:57 am

✔ 最佳答案

a) 2OH⁻(aq) + Cr₂O₇²⁻(aq) → 2CrO₄²⁻(aq) + H₂O(ℓ)
The reaction is NOT redox because there is no change in oxidation number.

b) I₂O₅(s) + 5CO(g) → I₂(s) + 5CO₂(g)
The reaction is redox.
I₂O₅ is the oxidizing agent because it is reduced as the oxidation number of I decreases from +5 to 0.
CO is the reducing agent because it is oxidized as the oxidation number of C increases from 0 to +4.

c) PBr₃(ℓ) + 3H₂O(ℓ) → H₃PO₃(aq) + 3HBr(aq)
The reaction is NOT redox because there is no change in oxidation number.

d) 2Hg²⁺(aq) + N₂H₄(aq) → 2Hg(ℓ) + N₂(g) + 4H⁺(aq)
The reaction is redox.
Hg²⁺ is the oxidizing agent because it is reduced as the oxidation number of Hg decreases from +2 to 0.
N₂H₄ is the reducing agent because it is oxidized as the oxidation number of N increases from -2 to 0.

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