What is electronic arranegment of metal atom/ion in octahedral complex with ${\mathrm{d}}^4$ configuration , if ${∆}_0$< pairing energy ?

(a) ${\mathrm{t}}_{2\mathrm{g}}^4{\mathrm{e}}_{\mathrm{g}}^0$                       (b) ${\mathrm{e}}_{\mathrm{g}}^4 {\mathrm{t}}_{2\mathrm{g}}^0$               (c) ${\mathrm{t}}_{2\mathrm{g}}^3{\mathrm{e}}_{\mathrm{g}}^1$           (d) ${\mathrm{e}}_{\mathrm{g}}^2{\mathrm{t}}_{2\mathrm{g}}^2$

Match List-I with List-II and select the correct answer using the codes given below :

                      List-I                                              List-II

(I) $[{\mathrm{FeF}}_6{]}^{3-}$                                                   (A) 1.73 BM

(II) $\left[\mathrm{Ti}\right({\mathrm{H}}_2\mathrm{O}{)}_6{]}^{3+}$                                             (B) 5.93 BM

(III) $\left[\mathrm{Cr}\right({\mathrm{NH}}_3{)}_6{]}^{3+}$                                            (C) 0.00 BM

(IV) $\left[\mathrm{Ni}\right({\mathrm{H}}_2\mathrm{O}{)}_6{]}^{2+}$                                             (D) 2.83 BM

(V)  $\left[\mathrm{Fe}\right(\mathrm{CN}{)}_6{]}^{4-}$                                               (E) 3.88 BM

          (I)    (II)   (III)   (IV)   (V)                       (I)    (II)   (III)   (IV)   (V) 

(a)      B      A       C       D      E                  (b)    B      A       E       D      C

(c)       B     C       D       E      A                 (d)     D     E       A       B       C  

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