Multiple choice Primary valency of Cr in complex [Cr (H2O)4Cl2]+ is 2 3 5 6 Reveal answer Fill a bubble to check yourself B Correct answer Explanation In [Cr(H2O)4Cl2]+, the oxidation state of Cr is calculated as: Cr + 4(0) + 2(-1) = +1, so Cr = +3.