Which of the following are redox reactions? p4(s)+10hclo(aq)+6h2o(l)→4h3po4(aq) +10hcl(aq) br2(l)+2k(s)→2kbr(s) ch3ch2oh(l)+3o2(g)→3h2o(l)+2co2(g) zncl2(aq)+2naoh(aq)→zn(oh)2(s)+2nac l(aq) for those reactions that are redox, indicate which elements are oxidized.

The answer to your question is:

Explanation:

a) P4⁰(s) + 10H⁺¹Cl⁺¹O⁻²(aq) + 6H2O(l) → 4H⁺¹3P⁺⁵O4⁻²(aq) + 10H⁺¹Cl⁻¹(aq)

It's a Redox reaction    

Phosphorous oxidizes  goes from 0 to +5

b)  Br2⁰(l) + 2K(s)⁰ → 2K⁺¹Br⁻¹(s)

 It's an oxidation reaction  

 Potassium oxidizes goes from 0 to +1

c) CH3CH2OH(l) + 3O2(g) → 3H2O(l) + 2 CO2(g)

It is not a REDOX reaction

d) Zn⁺²Cl2⁻¹(aq) + 2Na⁺¹O⁻²H⁺¹(aq) → Zn⁺²(O⁻²H⁺¹)2(s) + 2Na⁺¹Cl⁻¹(aq)

It's not a REDOX  reaction

that's what i got you can count the number of atoms