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

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