The correct electronic configuration for the complex [Ni(NH₃)₆]²⁺ is:

1. ${\mathrm{t}}_{2\mathrm{g}}^4 {\mathrm{e}}_{\mathrm{g}}^2$

2. ${\mathrm{t}}_{2\mathrm{g}}^6 {\mathrm{e}}_{\mathrm{g}}^2$

3. ${\mathrm{t}}_{2\mathrm{g}}^7 {\mathrm{e}}_{\mathrm{g}}^1$

4. ${\mathrm{t}}_{2\mathrm{g}}^4 {\mathrm{e}}_{\mathrm{g}}^4$

0.001 mole of $\left[\mathrm{Co}{\left({\mathrm{NH}}_3\right)}_5\left({\mathrm{NO}}_3\right)·\left({\mathrm{SO}}_4\right)\right]$ was passed through a cation exchanger and the acid coming out of it required 20 ml of 0.1 M NaOH for neutralization. Hence, the complex is

1.  $\left[\mathrm{Co}{\left({\mathrm{NH}}_3\right)}_5{\mathrm{SO}}_4\right]{\mathrm{NO}}_3$

2.  $\left[\mathrm{Co}{\left({\mathrm{NH}}_3\right)}_5\left(N{O}_3\right)\right]{\mathrm{SO}}_4$

3.  $\left[\mathrm{Co}{\left({\mathrm{NH}}_3\right)}_5{\mathrm{SO}}_4\right]{\mathrm{NO}}_3{\mathrm{SO}}_4$

4.  All of these

Which of the following statements is correct regarding the chirality (optical isomerism) of the cis and a trans isomer of the type M(aa)₂b₂
(M stands for metal, aa is a bidentate ligand, and b is a chiral ligand)?
  

1. The trans form is achiral and optically inactive while the cis form is chiral and exists in two enantiomeric forms

2. Both cis and transforms are achiral and optically inactive

3. The trans form is chiral and exists in two enantiomeric forms while the cis form is achiral and optically inactive

4. Both the cis and trans form are chiral and each exists in two enantiomeric forms

Which statement about the coordination number of a cation is true?

If ${\mathrm{Cd}}^{2+}$ and ${\mathrm{Cu}}^{2+}$ both are present, both are complexed by ${\mathrm{CN}}^{-}$ and ${\mathrm{H}}_2\mathrm{S}$ gas is passed, which one of the following pairs of complexes and their relative stability enables the separation of ${\mathrm{Cu}}^{2+}$ and ${\mathrm{Cd}}^{2+}$?

1.  ${\mathrm{K}}_3\left[\mathrm{Cu}\left({\mathrm{CN}}_4\right)\right]$: more stable and ${\mathrm{K}}_2\left[\mathrm{Cd}\left({\mathrm{CN}}_4\right)\right]$: less stable

2.  ${\mathrm{K}}_2\left[\mathrm{Cu}\left({\mathrm{CN}}_4\right)\right]$: less stable and ${\mathrm{K}}_2\left[\mathrm{Cd}\left({\mathrm{CN}}_4\right)\right]$: more stable

3.  ${\mathrm{K}}_2\left[\mathrm{Cu}\left({\mathrm{CN}}_4\right)\right]$: more stable and ${\mathrm{K}}_2\left[\mathrm{Cd}\left({\mathrm{CN}}_4\right)\right]$: more stable

4.  ${\mathrm{K}}_3\left[\mathrm{Cu}\left({\mathrm{CN}}_4\right)\right]$: less stable and ${\mathrm{K}}_2\left[\mathrm{Cd}\left({\mathrm{CN}}_4\right)\right]$: more stable

The spin-only magnetic moments of ${\left[\mathrm{Mn}{\left(\mathrm{CN}\right)}_6\right]}^{4-} \mathrm{and} {\left[{\mathrm{MnBr}}_4\right]}^{2-}$ in Bohr Magnetons, respectively, are

1.  5.92 and 5.92

2.  4.89 and 1.73

3.  1.73 and 5.92

4.  1.73 and 1.73

The crystal field stabilization energies (CFSE) of high-spin and low-spin (d⁶) octahedral metal complexes in terms of Δ₀, respectively, are:

1.  -0.4 and -2.4

2.  -2.4 and -0.4

3.  -0.4 and 0.0

4.  -2.4 and 0.0

The oxidation state of cobalt in the following molecule is:

1. 3

2. 1

3. 2

4. 0

For a tetrahedral complex ${\left[{\mathrm{MCI}}_4\right]}^{2-}$, the spin-only magnetic moment is 3.83 B.M. The element M is 

1.  Co

2.  Cu

3.  Mn

4.  Fe

Tetrahedral and diamagnetic compound among the following is: