Determine the overall charge on each complex tetraquadichlorochromium (iii)

             +1

Explanation:
                   Molecular Formula of Tetraquadichlorochromium (III) is as follow,

                                               [Cr(H₂O)₄Cl₂]ˣ

The oxidation states of elements present in complex are,

                                  H₂O  =  0     (Neutral Ligand)

                                  Cl  =  -1

                                  Cr  =  +3      (Given)

                                  x  =  Overall charge
So,
                                 [+3 + (0)₄ + (-1)₂]  =  x

                                 [+3 - 2]  =  x

                                          x  =  +1

Result:
            Overall charge on Tetraquadichlorochromium (III) is +1.

The answer to this is the 3rd choice!