Write an equation for the reaction in aqueous solution between [Cr(H₂O)₆]²+ and an excess of chloride ions.
a) [Cr(H₂O)₆]²+ + Cl⁻ → [CrCl(H₂O)₅]⁺ + H₂O
b) [Cr(H₂O)₆]²+ + 2Cl⁻ → [CrCl₂(H₂O)₄] + 2H₂O
c) [Cr(H₂O)₆]²+ + 6Cl⁻ → [CrCl₆]⁴- + 6H₂O
d) [Cr(H₂O)₆]²+ + 4Cl⁻ → [CrCl₄(H₂O)₂] + 2H₂O
