Exercise 1

$2.33 \mathrm{g}$ of compound $\mathrm{X}$ (empirical formula ${\mathrm{CoH}}_{12}{\mathrm{N}}_4{\mathrm{Cl}}_3$) upon treatment with excess ${\mathrm{AgNO}}_3$ solution produces $1.435 \mathrm{g}$ of a white precipitate. The primary and secondary valences of cobalt in compound $\mathrm{X}$, respectively, are [Given : Atomic mass: $\mathrm{Co}=59,\mathrm{Cl}=35.5,\mathrm{Ag}=108$]

The octahedral complex ${\mathrm{CoSO}}_4\mathrm{Cl}.5{\mathrm{NH}}_3$ exists in two isomeric forms, $\mathrm{X}$ and $\mathrm{Y}.$ Isomer X reacts with ${\mathrm{AgNO}}_3$ to give a white precipitate, but does not react with ${\mathrm{BaCl}}_2.$ Isomer $\mathrm{Y}$ gives a white precipitate with ${\mathrm{BaCl}}_2$, but does not react with ${\mathrm{AgNO}}_3.$ X and Y are:

Among (i) ${\left[\mathrm{Cr}(\mathrm{en}{)}_3\right]}^{3+}$, (ii) trans-[Cr(en) $\left._{2} \mathrm{Cl}_{2}\right]^{+},$ (iii) $\mathrm{cis}-{\left[\mathrm{Cr}{\left(\mathrm{en}\right)}_2{\mathrm{Cl}}_2\right]}^{+}$, (iv) ${\left[\mathrm{Co}{\left({\mathrm{NH}}_3\right)}_4{\mathrm{Cl}}_2\right]}^{+}$, the optically active complexes are

For an octahedral complex, ${\mathrm{MX}}_4{\mathrm{Y}}_2(\mathrm{M}=$a transition metal, $\mathrm{X}$ and $\mathrm{Y}$ are the monodentate achiral ligands), the correct statement, among the following, is

The complex that can exhibit linkage isomerism is:

Among the following, the pair of paramagnetic complexes is:

The complex having the highest spin-only magnetic moment is:

The heme group found in hemoglobin: