The number of isomers of $\left[\mathrm{Co}\left(\mathrm{dien}\right){\mathrm{CI}}_3\right]$ is (where 'dean' is diethylene triamine)

1.  2

2.  3

3.  44.  5

Choose the incorrect statement regarding the complex $\left[{\mathrm{NiCl}}_2{\left({\mathrm{PR}}_3\right)}_2\right]$
(1) When R group in ${\mathrm{PR}}_3$ is ${\mathrm{C}}_6{\mathrm{H}}_5$ then complex will be tetrahedral

(2) When R group in ${\mathrm{PR}}_3$ is cyclohexyl then complex will be square planar

(3) When R group is H then equilibrium mixture of tetrahedral and square planar form is obtained

(4) When R group is H then complex will be tetrahedral only

The incorrect statement about Re—Re bonding in ${\left[{\mathrm{Re}}_2{\mathrm{X}}_8\right]}^{2-}$ are,
(1) Re—Re bond length is abnormally short

(2) Re—Re bond is comprised of one G, two qt and
one ö—bond

(3) If Re—Re bond points along the z-axis, then the square planar ${\mathrm{ReX}}_4$ unit will use s, $P_x, P_y$and $d_{{\mathit{x}}^{\mathit{2}}\mathit{ }\mathit{-}\mathit{ }{\mathit{y}}^{\mathit{2}}}$ orbitals for the formation of four Re—X $\sigma$ bonds

(4) ${\mathrm{d}}_{\mathrm{xy}}$ orbitals will overlap to form $\delta$—bond

The Crystal Field Stabilization Energy (CFSE) and the spin-only magnetic moment in Bohr Magneton (BM) for the complex ${\mathrm{K}}_3\left[\mathrm{Fe}{\left(\mathrm{CN}\right)}_6\right]$ are, respectively,

1.  $0.0{∆}_0 \mathrm{and} \sqrt{35} \mathrm{BM}$

2.  $-2.0{∆}_0 \mathrm{and} \sqrt{3} \mathrm{BM}$

3.  $-0.4{∆}_0 \mathrm{and} \sqrt{24} \mathrm{BM}$

4.  $-2.4{∆}_0 \mathrm{and} \sqrt{0} \mathrm{BM}$

${\mathrm{Zn}}^{2+} + 4{\mathrm{NH}}_3 \rightleftharpoons {\left[\mathrm{Zn}{\left({\mathrm{NH}}_3\right)}_4\right]}^{2+}$. The concentration of free ${\mathrm{Zn}}^{2+}$ ions in a solution of the complex ion ${\left[\mathrm{Zn}{\left({\mathrm{NH}}_3\right)}_4\right]}^{2+}$ can be increased significantly by the addition of

1.  ${\mathrm{H}}_2\mathrm{O}$

2.  HCl(aq)

3.  ${\mathrm{NH}}_3\left(\mathrm{aq}\right)$

4.  ${\mathrm{NH}}_4\mathrm{Cl}\left(\mathrm{aq}\right)$

Given the following pair of isomers:
[Cr(NH₃)₆][Cr(NO₂)₆] and
[Cr(NH₃)₄(NO₂)₂][Cr(NH₃)₂(NO₂)₄]
Aside from X-ray diffraction, how could the following pairs of isomers be distinguished from one another?

1. Cryoscopic method
2. Measuring their molar conductance
3. Measuring their magnetic moments
4. Observing their colors

The hybridizations of $\left[\mathrm{Ni}{\left(\mathrm{CO}\right)}_4\right] \mathrm{and} {\left[\mathrm{Cr}\left({\mathrm{H}}_2\mathrm{O}{)}_6\right)\right]}^{2+}$, respectively, are : 

1.  ${\mathrm{sp}}^3 \mathrm{and} {\mathrm{d}}^3{\mathrm{sp}}^2$

2.  ${\mathrm{dsp}}^2 \mathrm{and} {\mathrm{d}}^2{\mathrm{sp}}^3$

3.  ${\mathrm{sp}}^3 \mathrm{and} {\mathrm{d}}^2{\mathrm{sp}}^3$

4.  ${\mathrm{dsp}}^2 \mathrm{and} {\mathrm{sp}}^3{\mathrm{d}}^2$

Which of the following is true about the complex $\left[{\mathrm{PtCl}}_2\left({\mathrm{NH}}_3\right) \left(H20\right)\right]$; [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

Correct statement among the following regarding $\mathrm{Ni}{\left(\mathrm{CO}\right)}_4$, ${\left[\mathrm{Ni}{\left(\mathrm{CN}\right)}_4\right]}^{2-}$ and ${\left[{\mathrm{NiCl}}_4\right]}^{2-}$ is -

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

Among the following statements, the correct statement is/are -

a.  ${\left[\mathrm{Ni}{\left({\mathrm{H}}_2\mathrm{O}\right)}_6\right]}^{2+}$ and ${\left[\mathrm{Ni}{\left({\mathrm{NH}}_3\right)}_6\right]}^{2+}$ have the same value of CFSE

b.  ${\left[\mathrm{Ni}{\left({\mathrm{H}}_2\mathrm{O}\right)}_6\right]}^{2+}$ and ${\left[\mathrm{Ni}{\left({\mathrm{NH}}_3\right)}_6\right]}^{2+}$ have the same value of the magnetic moment

c.  ${\left[\mathrm{Ni}{\left({\mathrm{H}}_2\mathrm{O}\right)}_{6^{}}\right]}^{2+}$ and ${\left[\mathrm{Ni}{\left({\mathrm{NH}}_3\right)}_6\right]}^{2+}$ have the same hybridization of nickel

1.  a & c only

2.  b & c only

3.  a & b only

4. All of the above