The hybridizations of [Ni(CO)₄] and [Cr(H₂O)₆]³⁺, respectively, are : 

1. sp³ and d³sp²

2. dsp² and d²sp³

3. sp³ and d²sp³

4. dsp²  and sp³d²

Which of the following is true about the complex $\left[{\mathrm{PtCl}}_2\left({\mathrm{NH}}_3\right){\left({\mathrm{OH}}_2\right)}_{}\right]$; [Atomic number of Pt = 78]

I.  It will have two geometrical isomeric forms, cis and trans

II.  The hybridization state of Pt(ll) is ${\mathrm{sp}}^3$

III.  It is a square planar complex

IV.  It is a diamagnetic complex

V.  It can show hydrate isomerism

VI.  It is a tetrahedral complex

1.  I, III, IV

2.  II, IV, V

3.  II, V, IV

4.  I, V, IV

A metal ion has ${\mathrm{d}}^6$ configuration. In octahedral complex entity of low spin, the number of electrons present in ${\mathrm{e}}_{\mathrm{g}}$ set of orbitals will be

Amongst $\mathrm{Ni}{\left(\mathrm{CO}\right)}_4$, ${\left[\mathrm{Ni}{\left(\mathrm{CN}\right)}_4\right]}^{2-}$ and [NiCl₄]^2- :

1.  $\mathrm{Ni}{\left(\mathrm{CO}\right)}_4$ and ${\left[{\mathrm{NiCl}}_4\right]}^{2-}$ are diamagnetic and ${\left[\mathrm{Ni}{\left(\mathrm{CN}\right)}_4\right]}^{2-}$ is paramagnetic.

2.  ${\left[{\mathrm{NiCl}}_4\right]}^{2-}$ and ${\left[\mathrm{Ni}{\left(\mathrm{CN}\right)}_4\right]}^{2-}$ are diamagnetic and $\mathrm{Ni}{\left(\mathrm{CO}\right)}_4$ is paramagnetic.

3.  $\mathrm{Ni}{\left(\mathrm{CO}\right)}_4$ and ${\left[\mathrm{Ni}{\left(\mathrm{CN}\right)}_4\right]}^{2-}$ are diamagnetic and ${\left[{\mathrm{NiCl}}_4\right]}^{2-}$ is paramagnetic.

4.  $\mathrm{Ni}{\left(\mathrm{CO}\right)}_4$ is diamagnetic and ${\left[{\mathrm{NiCl}}_4\right]}^{2-}$ and ${\left[\mathrm{Ni}{\left(\mathrm{CN}\right)}_4\right]}^{2-}$ are paramagnetic.

Which of the following statements is correct?

1.  a & c only

2.  b & c only

3.  a & b only

4. All of these

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