Among Cl^-, Ar, K⁺, Ca²⁺, Br^-, Kr, Rb⁺, and Sr²⁺, which one has the largest radius?

Question H:

Among Cl^-, Ar, K⁺, Ca²⁺, Br^-, Kr, Rb⁺, and Sr²⁺, which one has the largest ionization energy?

Question I:

When H⁺(aq) reacts with Fe(s) to produce Fe²⁺(aq) and hydrogen gas, is H⁺(aq) an acid, base, oxidizing agent, or reducing agent?

Question J:

What is the oxidation state of the C atoms in C₆H₁₂O₃?