Set of d-orbitals which is used by central metal during formation of ${\mathrm{MnO}}_4^{-}$?

(a) ${\mathrm{d}}_{{\mathrm{x}}^2-{\mathrm{y}}^2 },{\mathrm{d}}_{{\mathrm{z}}^{2 }},{\mathrm{d}}_{\mathrm{xy}}$                    (b) ${\mathrm{d}}_{\mathrm{xy}} , {\mathrm{d}}_{\mathrm{yz}} , {\mathrm{d}}_{\mathrm{xz}}$

(c) ${\mathrm{d}}_{{\mathrm{x}}^2-{\mathrm{y}}^2} , {\mathrm{d}}_{\mathrm{xy}} , {\mathrm{d}}_{\mathrm{xz}}$                   (d) ${\mathrm{d}}_{{\mathrm{x}}^2-{\mathrm{y}}^2} , {\mathrm{d}}_{z^2} , {\mathrm{d}}_{\mathrm{xz}}$

The hybridization of the complex $\left[{\mathrm{CrCl}}_2\right({\mathrm{NO}}_2{)}_2({\mathrm{NH}}_3{)}_2{]}^{-}$ is:

(1) ${\mathrm{sp}}^3{\mathrm{d}}^2$                       

(2) ${\mathrm{d}}^2{\mathrm{sp}}^3$

(3) ${\mathrm{sp}}^3\mathrm{d}$                         

(4) cannot be predicted 

The following complexes are given :

(1) $\mathrm{trans}-\left[\mathrm{Co}\right({\mathrm{NH}}_3{)}_4{\mathrm{Cl}}_2{]}^{+}$

(2) $\mathrm{cis}-\left[\mathrm{Co}\right({\mathrm{NH}}_3{)}_2(\mathrm{en}{)}_2{]}^{3+}$

(3) $\mathrm{trans}-\left[\mathrm{Co}\right({\mathrm{NH}}_3{)}_2(\mathrm{en}{)}_2{]}^{3+}$

(4) ${\mathrm{NiCl}}_4^{2-}$

(5) ${\mathrm{TiF}}_6^{2-}$

(6) ${\mathrm{CoF}}_6^{3-}$

Choose the correct code:

(a) (1),(2) are optically active, (3) is optically inactive

(b) (2) is optically active ; (1), (3) are optically inactive

(c) (4), (5) are coloured and (6) is colourless

(d) (4) is coloured and (5),(6) are colourless

Which of the following can show geometrical isomerism?

(a)             (b) $\left[\mathrm{Co}\right(\mathrm{en}{)}_2{\mathrm{NH}}_3\mathrm{Cl}{]}^{2+}$

(c) Both (a) and (b)                                (d) None of these 

Which of the following has both fac-mer and optical isomers?

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

2. ${\left[\mathrm{Co}{\left(en\right)}_3\right]}^{3-}$

3. $\left[\mathrm{Co}{\left(\mathrm{gly}\right)}_3\right]$                                             

4. none of these

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