Which one of these equations describes a redox reaction? O
CaBr2(aq) + H2SO4(aq) → CaSO4(s) + 2HBr(g)
O
H(aq) + OH(aq) → H20(1)
2KBr(aq) + Pb(NO3)2(aq) + 2KNO3(aq) + PbBr2(s)
O 2Al(s) + 3H2SO4(aq) → Al2(SO4)3(aq) + 3H2()
CO32-(aq) + HS04 (aq) → H3 (aq) + SO42-(aq)

The answer is b i think

Its a hope this

Answerthis solution will not form a precipitateexplanationsolubility equilbrium:         pbf₂(s)  ⇄ pb²⁺(aq) + 2 f⁻(aq)the solubility product expression is    (we exclude solids from the equilibrium expression).now suppose we have the trial ion product q, which we can define as    then, we can interpret  q as the product of the concentration of the ions that we have and ksp as the product of the ion concentrations that are needed to form a saturated solution.if q > ksp, then that implies that there will be a surplus of ions that exceed the amount that is required to form a saturated solution. a precipitate will then form (the precipitate continually  forms until the surplus ions are removed and q is decreased to ksp's value).if q = ksp, the saturated solution that forms is barely saturated and the precipitate will be minimal.if q < ksp, then the ion concentration will not be enough to form a saturated solution (so no precipitate).using our information, we calculate the trial ion product:     since q = 2.7  × 10⁻⁸ < ksp =  4  ×  10⁻⁸, a precipitate will not form.

The following is a blank kkkxxx idk ttyl