KVPY PROBLEMS (PREVIOUS YEARS)

The spin only magnetic moment of ${\left[{\mathrm{ZCl}}_4\right]}^{2-}$ is $3.87 \mathrm{BM}$ where $\mathrm{Z}$ is

The geometry and the number of unpaired electron(s) of ${\left[{\mathrm{MnBr}}_4\right]}^{2-}$, respectively, are:

Among the following complexes, the one that can exhibit optical activity is:

$2.33 \mathrm{g}$ 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 geometry and magnetic property of ${\left[{\mathrm{NiCl}}_4\right]}^{2-}$, respectively, 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

The complex that can exhibit linkage isomerism is:

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