Question

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