Optical inactivity of meso isomers is due to

The optical inactivity of meso - tartaric acid is because of

The total possible number of optically inactive isomers of the complex [Pt(NH_(3))_(2)FClBrI] would be :

The optically active and meso forms possible for the following structure will be

Sum of total number of opticaly active and optical inactive isomers of following compound.

Determine Stereoisomers, Optically Active, Optically Inactive, Meso compounds || Isomers in Cyclic Compound

Which of the following complex is optically inactive but its other geometrical isomer is optically active ?