The total number of stereoisomers for the complex [ Cr ( ox ) 2 ClBr ] 3 – (where ox = oxalate) is

The complex $\left[\mathrm{Cr}\right(\mathrm{ox}{)}_2\mathrm{ClBr}{]}^{3–}$ exhibits two geometrical isomers. Among these isomers Cis-isomer is optically active.  Hence, the total number of stereoisomers for the given complex is 3.