Which of the followingare redox reactions? And Why please Thanks. a.) K2S(aq) +

Question

Which of the followingare redox reactions? And Why please Thanks. a.)      K2S(aq) + CuSO4(aq) yieldsK2SO4(aq) + CuS(s) b.)      H2CO3(aq) yields H2O(l) + CO2(g) c.)     2NO(g) yields N2(g) + O2(g) d.)      NH3(g) + HCl(aq) yields NH4Cl(aq) e.)      2Na(s) + 2H2O(l) yields2NaOH(aq) + H2(g) f.)        2H2(g) +O2(g) yields 2H2O(l) Which of the followingare redox reactions? And Why please Thanks. a.)      K2S(aq) + CuSO4(aq) yieldsK2SO4(aq) + CuS(s) b.)      H2CO3(aq) yields H2O(l) + CO2(g) c.)     2NO(g) yields N2(g) + O2(g) d.)      NH3(g) + HCl(aq) yields NH4Cl(aq) e.)      2Na(s) + 2H2O(l) yields2NaOH(aq) + H2(g) f.)        2H2(g) +O2(g) yields 2H2O(l)

Explanation / Answer

c.)     2NO(g) yields N2(g) + O2(g) e.)      2Na(s) + 2H2O(l) yields2NaOH(aq) + H2(g) f.)        2H2(g) +O2(g) yields 2H2O(l)
In redox reactions, there must be the change in the oxidationnumbers of some of the atoms in the compounds of either side.for example in the following reaction,the oxidation numbersof hydrogen & oxygen are zero because those are in theirelemental state.But in H2O (the product) the o.nof hydrogen is +1 &the o.n of oxygen is -2 assuperscribed bellow. Increase the o.n is oxidation & decreasein o.n is reduction.

  0           0                    +1-2
2H2(g) + O2(g) yields 2H2O(l)

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