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The complex $[Fe(ox)_{3}]^{3-}$ contains three bidentate oxalate ligands. This is a tris-chelated octahedral complex of the type $[M(AA)_{3}]$. Such complexes lack a plane of symmetry and a center of inversion, making them optically active (chiral). Therefore, Statement-I is correct.
The complex trans-$[Cr(H_{2}O)_{2}(ox)_{2}]^{-}$ has two oxalate ligands and two water ligands in a trans configuration. In the trans isomer, the two water ligands are 180 degrees apart, and the two oxalate ligands lie in the same plane. This configuration possesses a plane of symmetry (and a center of inversion), which renders the molecule achiral (optically inactive). Therefore, Statement-II is incorrect.
Since Statement-I is correct and Statement-II is incorrect, the correct option is (D).
Final Answer: Statement-I is correct but Statement-II is incorrect