Chemistry Coordination Compounds

The oxidation states of iron atoms in compounds (A), (B) and (C), respectively, are x, y and z. The sum of x,y and z is [numerical value].
(A) Na?[Fe(CN)?(NOS)], (B) Na?[FeO?], (C) [Fe?(CO)?]

For octahedral Mn(II) and tetrahedral Ni(II) complexes, consider the following statements

(I) both the complexes can be high spin.
(II) Ni(II) complex can very rarely be of low spin.
(III) with strong field ligands, Mn(II) complexes can be low spin.
(IV) aqueous solution of Mn(II) ions is yellow in color.
The correct statements are:

Consider that d? metal ion (M²?) forms a complex with aqua ligands, and the spin only magnetic moment of the complex is 4.90BM. The geometry and the crystal field stabilization energy of the complex is:

The number of Cl=O bonds in perchloric acid is, " "

The major products of the following reaction are:

Consider the following reactions:
'A' (C₇H₁₄) --(ozonolysis)--> 'B' + 'C'
'B' --(I₂ + NaOH)--> yellow ppt
'C' --(I₂ + NaOH)--> no yellow ppt
'C' --(Ag₂O/Δ)--> silver mirror
'C' --(LiAlH₄)--> 'D' --(Anhydrous ZnCl₂ & Conc. HCl)--> gives white turbidity within 5 minutes
'A' is:

Considering that ∆₀ > P, the magnetic moment (in BM) of [Ru(H₂O)₆]²⁺ would be

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

The volume (in $\mathrm{m}\mathrm{L}$ ) of $0.125\mathrm{M}{\mathrm{A}\mathrm{g}\mathrm{N}\mathrm{O}}_3$ ${}_{}$ required to quantitatively precipitate chloride ions in $0.3\mathrm{g}$ $$ of $\left[\mathrm{C}\mathrm{o}{\left({\mathrm{N}\mathrm{H}}_3\right)}_6\right]{\mathrm{C}\mathrm{l}}_3$ $\left[{\left({}_{}\right)}_{}\right]{}_{}$ is M $\left[\mathrm{C}\mathrm{o}{\left({\mathrm{N}\mathrm{H}}_3\right)}_6{\mathrm{C}\mathrm{l}}_3\right]=267.46\mathrm{g}/\mathrm{m}\mathrm{o}\mathrm{l}$ $\left[{\left({}_{}\right)}_{}{}_{}\right]$

${}^{\mathrm{M}}{\mathrm{A}\mathrm{g}\mathrm{N}\mathrm{O}}_3=169.87\mathrm{g}/\mathrm{m}\mathrm{o}\mathrm{l}$

The complex that can show fac- and mer-isomers is :