Do the reactions involved in ozone depletion involve changes in oxidation state of the O atoms?

Do the reactions involved in ozone depletion involve changes in oxidation state of the O atoms? Explain.

Indicate whether the following balanced equations involve oxidation-reduction.

If they do, identify the elements that undergo changes in oxidation number.

1. 2AgNO₃(aq) + CoCl₂(aq) → 2AgCl(s) + Co(NO₃)_{2 (aq)}

2. 2PbO_{2 (s) →} 2 PbO(s) + O₂(g)

3. 2H₂SO₄(aq) + 2NaBr(s) → Br₂(l) + SO₂(g) + Na₂SO₄(aq) + 2 H₂O(l)

One Class Solution:-

a) reaction is not redox

b) Pb and O change oxidation number

c) is redox reaction. S and Br change oxidation number

Indicate whether the following balanced equations involve oxidation- reduction. If they do, identify the elements that undergo changes in oxidation number.

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

b) NaI (aq) + 3HOCl (aq) → NaIO₃ (aq) + 3HCl (aq)

c) 3SO₂ (g) + 2 HNO₃(aq) +2H₂O (l)→ 3 H₂SO₄(aq) + 2 NO(g)

One Class Solution:-

Reaction a) is not redox reaction

Reaction b) is redox reaction.

-1 +5

I^- → IO₅^-

Cl⁺¹ → Cl^-1

Reaction C) is redox reaction.

+4 +6 +5 +2

SO₂ → SO₄^2- NO₃^- → NO