A solution containing 0.319 g of complex ${\mathrm{CrCl}}_3$. $6{\mathrm{H}}_2\mathrm{O}<mspace\; width="1em"></mspace>$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.  $\left[\mathrm{CrCl}{\left({\mathrm{H}}_2\mathrm{O}\right)}_5\right]{\mathrm{Cl}}_2<mspace\; width="1em"></mspace>·<mspace\; width="1em"></mspace>{\mathrm{H}}_2\mathrm{O}$

2.  $\left[\mathrm{Cr}{\left({\mathrm{H}}_2\mathrm{O}\right)}_6\right]{\mathrm{Cl}}_3$

3.  $\left[{\mathrm{CrCl}}_2{\left({\mathrm{H}}_2\mathrm{O}\right)}_4\right]\mathrm{Cl}<mspace\; width="1em"></mspace>·{\mathrm{H}}_2\mathrm{O}$

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. K₂[PtCl₆]

2. PtCl₄.2NH₃ 

3. PtCl₄.3NH₃

4. PtCl₄.5NH₃

Zero magnetic moment of the 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 

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

Choose the correct match.
 

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

1.  Tetrahedral, tetrahedral; ${\mathrm{sp}}^3,<mspace\; width="1em"></mspace>{\mathrm{sp}}^3$; O, 2.82

2.  Tetrahedral, square planar; ${\mathrm{sp}}^3,<mspace\; width="1em"></mspace>{\mathrm{dsp}}^2$; O, 2.82

3.  Tetrahedral, octahedral; ${\mathrm{sp}}^3,<mspace\; width="1em"></mspace>{\mathrm{d}}^2{\mathrm{sp}}^3$; 2.82, O

4.  Square planar, tetrahedral; ${\mathrm{dsp}}^2,<mspace\; width="1em"></mspace>{\mathrm{sp}}^3$; 2.82, 2.82

What are the geometries of \([Ni(CO)_4]\) and \([Ni(PPh_3)_2Cl_2]\) respectively?

1. Both square planar.

2. Tetrahedral and square planar, respectively.

3. Both tetrahedral.

4. Square planar and tetrahedral, respectively.

Which one of the following high spin complexes has the largest crystal field stabilization energy?

1.  ${\left[\mathrm{Cr}{\left({\mathrm{H}}_2\mathrm{O}\right)}_6\right]}^{2+}$

2.  ${\left[\mathrm{Cr}{\left({\mathrm{H}}_2\mathrm{O}\right)}_6\right]}^{3+}$

3.  ${\left[\mathrm{Mn}{\left({\mathrm{H}}_2\mathrm{O}\right)}_6\right]}^{2+}$

4.  ${\left[\mathrm{Mn}{\left({\mathrm{H}}_2\mathrm{O}\right)}_6\right]}^{3+}$

It is an experimental fact that DMG + Ni(ll)salt + ${\mathrm{NH}}_4\mathrm{OH}$ $\to$ Red precipitate Which of the following is wrong about this red precipitate?

(1)  It is a non-ionic complex

(2)  It has a square planar geometry

(3)  It has tetrahedral geometry

(4)  It is a diamagnetic complex