The number of geometrical isomers for $[Co(NH_3)_3(NO_2)_3]$ is ....

Number of stereoisomers possible for the octahedral complexes $[Co(NH_3)_3Cl_3]$ and $[Ni(en)_2Cl_2]$,respectively,are (where $en = 1,2-$ethylenediamine):

Consider the following complex compounds and identify the compounds which are optically active.
$I.$ $[Co(NO_2)_3(NH_3)_3]$
$II.$ $cis-[RhCl_2(NH_3)_4]^+$
$III.$ $[Cr(OX)_3]^{3-}$
$IV.$ $cis-[PtCl_2(en)]$
$V.$ $trans-[Cr(en)_2Br_2]^+$
$VI.$ $cis-[Cr(en)_2Br_2]^+$

The complex ion $[Pt(NO_2)(py)(NH_3)(NH_2OH)]^{+}$ exhibits how many geometric isomers?

Match List-$I$ with List-$II$ and select the correct answer using the codes given below:

List-$I$	List-$II$
$I. [FeF_6]^{3-}$	$A. 1.73 \ BM$
$II. [Ti(H_2O)_6]^{3+}$	$B. 5.93 \ BM$
$III. [Cr(NH_3)_6]^{3+}$	$C. 0.00 \ BM$
$IV. [Ni(H_2O)_6]^{2+}$	$D. 2.83 \ BM$
$V. [Fe(CN)_6]^{4-}$	$E. 3.88 \ BM$

What type of color is observed when a compound absorbs $red$ coloured light?