Consider the complex ions,$trans-[Co(en)_2Cl_2]^+$ $(A)$ and $cis-[Co(en)_2Cl_2]^+$ $(B)$. The correct statement regarding them is :

  • A
    both $(A)$ and $(B)$ can be optically active
  • B
    both $(A)$ and $(B)$ cannot be optically active
  • C
    $(A)$ can be optically active,but $(B)$ cannot be optically active
  • D
    $(A)$ cannot be optically active,but $(B)$ can be optically active

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The metal atom present in the complex $MABXL$ (where $A, B, X$ and $L$ are unidentate ligands and $M$ is metal) involves $sp^3$ hybridization. The number of geometrical isomers exhibited by the complex is:

For the tetrahedral complex $[MnBr_4]^{2-}$, the spin-only magnetic moment value is $....$ (At. no. of $Mn = 25$) (in $BM$)

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