Which half reaction correctly describes the reduction that is taking place

The correct answer is the option A which is: Cl2 + 2e- → 2Cl-

Explanation:

Reduction is the gain of electrons and resulting in neutral or negative ions.

It is also the gain of hydrogen and release of oxygen ions.

According to first most definition, option A describes the reduction.Option B is incomplete reaction.While C and D are oxidation reactions.

Only one reactant yields 2 or more products. meaning you will only have 1 product and it will break down into 2 or more products. eg. h2o -> h2 + o2

Answer is:     molar solubility of  yttrium fluorid is 4.23·10⁻⁶ m. balanced chemical reaction: yf₃(s)  → y³⁺(aq) + 3f⁻(aq). ksp = 8.62·10⁻²¹. ksp = [y³⁺]  · [f⁻]³.[y³⁺] = [yf₃] = s.[f⁻] = 3[yf₃] = 3s.ksp(yf₃)  = s  · (3s)³.8.62·10⁻²¹ = 27s⁴.s(yf₃)  =  ⁴√(8.62·10⁻²¹  ÷ 27).s(yf₃)  = 0.00000423 m.s(yf₃) = 4.23·10⁻⁶ m.