Which of the following pairs will not show the same magnetic moment ('spin only')?

1. ${\left[\mathrm{Cr}{\left({\mathrm{H}}_2\mathrm{O}\right)}_6\right]}^{3+} \mathrm{and} {\left[\mathrm{Fe}{\left({\mathrm{H}}_2\mathrm{O}\right)}_5\mathrm{NO}\right]}^{2+}$

2. ${\left[\mathrm{Mn}{\left(\mathrm{CN}\right)}_6\right]}^{4-} \mathrm{and} {\left[\mathrm{Fe}{\left(\mathrm{CN}\right)}_6\right]}^{3-}$

3.  $\left[\mathrm{Ni}{\left(\mathrm{CO}\right)}_4\right] \mathrm{and} {\left[\mathrm{Zn}{\left({\mathrm{NH}}_3\right)}_4\right]}^{2+}$

4.  None of these

Choose the incorrect statement

1.  In ${\left[\mathrm{Fe}{\left(\mathrm{CN}\right)}_6\right]}^{4-}$ Fe—C bond length is smaller than Fe—C bond length in  ${\left[\mathrm{Fe}{\left(Cl\right)}_6\right]}^{4-}$

2.  The EAN of Fe in ${\left[\mathrm{Fe}{\left(\mathrm{CN}\right)}_6\right]}^{4-}$ is 36

3.  ${\left[\mathrm{Fe}{\left(\mathrm{CN}\right)}_6\right]}^{3-}$more stable than ${\left[\mathrm{Fe}{\left(\mathrm{CN}\right)}_6\right]}^{4-}$

4.  ${\left[\mathrm{Fe}{\left(\mathrm{Phen}\right)}_3\right]}^{3+}$is more stable than ${\left[\mathrm{Fe}{\left(\mathrm{Phen}\right)}_3\right]}^{2+}$

A solution containing 0.319 g of complex ${\mathrm{CrCl}}_3$. $6{\mathrm{H}}_2\mathrm{O}$was passed through a cation exchanger and the solution given out was neutralized by 28.5 ml of 0.125 M NaOH. The correct formula of the complex will be [molecular weight of complex = 266.5]

1.  $\left[\mathrm{CrCl}{\left({\mathrm{H}}_2\mathrm{O}\right)}_5\right]{\mathrm{Cl}}_2 · {\mathrm{H}}_2\mathrm{O}$

2.   $[\mathrm{Cr}{(\mathrm{H}}_{}$₂O)6]Cl3

3.  $[{\mathrm{CrCl}}_2{(\mathrm{H}}_{}$₂O)4]Cl · H2O

4.  All are correct

The oxidation state and effective atomic number of Cr in bis(benzene) chromium are

1.  0, 36

2.  3, 35

3.  2, 36

4.  2, 35

Consider the following complexes

1.  ${\mathrm{K}}_2{\mathrm{PtCl}}_6$

2.  ${\mathrm{PtCl}}_4, 2{\mathrm{NH}}_3$

3.  ${\mathrm{PtCl}}_4, 3{\mathrm{NH}}_3$

4.  ${\mathrm{PtCl}}_4, 5{\mathrm{NH}}_3$

Their electrical conductance in aqueous solution respectively are

1.  256, 0, 97, 404

2.  404, 0, 97, 256

3.  256, 97, 0 ,404

4.  404, 97, 256, 0

Zero magnetic moment of octahedral complex ${\mathrm{K}}_2\left[{\mathrm{NiF}}_6\right]$ is due to
1.  Low spin ${\mathrm{d}}^6$ Ni(IV) complex

2.  Low spin ${\mathrm{d}}^8$ Ni(ll) complex

3.  High spin ${\mathrm{d}}^8$ Ni(ll) complex

4.  High spin ${\mathrm{d}}^6$ Ni(IV) complex

Which of the following statements is not correct?

1.  The complexes ${\left[{\mathrm{Fe}}_{}{\left({\mathrm{H}}_2\mathrm{O}\right)}_6\right]}^{2+}$ and ${\left[\mathrm{Fe}\left({\mathrm{CN}}_6\right)\right]}^{4-}$ differ in the state of hybridization of iron

2.  The complexes ${\left[\mathrm{Fe}{\left({\mathrm{H}}_2\mathrm{O}\right)}_6\right]}^{2+}$ and ${\left[\mathrm{Fe}\left({\mathrm{CN}}_6\right)\right]}^{4-}$ differ in the magnetic properties

3.  iron ion has the same secondary valency in the complexes ${\left[{\mathrm{Fe}}_{}{\left({\mathrm{H}}_2\mathrm{O}\right)}_6\right]}^{2+}$ and  ${\left[\mathrm{Fe}\left({\mathrm{CN}}_6\right)\right]}^{4-}$

4.   The complex ${\left[\mathrm{Fe}{\left({\mathrm{H}}_2\mathrm{O}\right)}_6\right]}^{2+}$ and ${\left[\mathrm{Fe}\left({\mathrm{CN}}_6\right)\right]}^{4-}$ differ in primary valency of iron

About $\left[\mathrm{Co}{\left({\mathrm{NH}}_3\right)}_6{\mathrm{Cl}}_2\right]$ and $\left[\mathrm{Co}{\left({\mathrm{NH}}_3\right)}_6{\mathrm{Cl}}_3\right]$, a correct match is

                                 $\left[\mathrm{Co}{\left({\mathrm{NH}}_3\right)}_6{\mathrm{Cl}}_3\right]$    $\left[\mathrm{Co}{\left({\mathrm{NH}}_3\right)}_6{\mathrm{Cl}}_2\right]$

1.  Stability        $\to$        less                     more

2.  Magnetism    $\to$     Paramagnetic      Diamagnetic

3.  Hybridization $\to$      ${\mathrm{sp}}^3{\mathrm{d}}^2$                ${\mathrm{d}}^2{\mathrm{sp}}^3$

4.  Complex       $\to$      Inner orbital       Outer orbital

$\left[\mathrm{Ni}{\left({\mathrm{PPh}}_3\right)}_4\right]$ and ${\left[{\mathrm{NiCl}}_4\right]}^{2-}$have geometry, hybridization and magnetic moments of the ions respectively

1.  Tetrahedral, tetrahedral; ${\mathrm{sp}}^3, {\mathrm{sp}}^3$; O, 2.82

2.  Tetrahedral, square planar; ${\mathrm{sp}}^3, {\mathrm{dsp}}^2$; O, 2.82

3.  Tetrahedral, octahedral; ${\mathrm{sp}}^3, {\mathrm{d}}^2{\mathrm{sp}}^3$; 2.82, O

4.  Square planar, tetrahedral; ${\mathrm{dsp}}^2, {\mathrm{sp}}^3$; 2.82, 2.82

The geometries of $\mathrm{Ni}{\left(\mathrm{CO}\right)}_4$ and [Ni(PPh₃)₂Cl₂] are : 

1.  Both square planar.

2.  Tetrahedral and square planar, respectively.

3.  Both tetrahedral.

4.  Square planar and tetrahedral, respectively.