The two compounds pentaamminesulphatocobalt (III) bromide and pentaamminesulphatocobalt (III) chloride represent :

(1) Linkage isomerism                   

(2) Ionization isomerism

(3) Coordination isomerism             

(4) No isomerism 

Select the correct code about complex $\left[\mathrm{Cr}\right({\mathrm{NO}}_2\left)\right({\mathrm{NH}}_3{)}_5\left]\right[{\mathrm{ZnCl}}_4]$ :

In the isoelectronic series of metal carbonyl, the CO bond strength is expected to increase in the order:

(1) $\left[\mathrm{Mn}\right(\mathrm{CO}{)}_6{]}^{+}<\left[\mathrm{Cr}\right(\mathrm{CO}{)}_6]<[\mathrm{V}(\mathrm{CO}{)}_6{]}^{-}$

(2) $\left[\mathrm{V}\right(\mathrm{CO}{)}_6{]}^{-}<\left[\mathrm{Cr}\right(\mathrm{CO}{)}_6]<[\mathrm{Mn}(\mathrm{CO}{)}_6{]}^{+}$

(3) $\left[\mathrm{V}\right(\mathrm{CO}{)}_6{]}^{-}<\left[\mathrm{Mn}\right(\mathrm{CO}{)}_6{]}^{+}<\left[\mathrm{Cr}\right(\mathrm{CO}{)}_6]$

(4) $\left[\mathrm{Cr}\right(\mathrm{CO}{)}_6]<[\mathrm{Mn}(\mathrm{CO}{)}_6{]}^{+}<[\mathrm{V}(\mathrm{CO}{)}_6{]}^{-}$

Which is not true about metal carbonyls?

1.  Here CO acts as a Lewis base as well as Lewis acid. 

2. Here metal acts as Lewis base as well as Lewis acid.

3. Here $\mathrm{d\pi }-\mathrm{p\pi }$ back bonding takes place.

4. Here $\mathrm{p\pi }-\mathrm{p\pi }$ back bonding takes place.

[Fe(H₂O)₆]²⁺ and [Fe(CN)₆]^4-  differ in:

1. Geometry and magnetic moment.

2. Geometry and hybridization.

3. Magnetic moment and colour.                       

4. Hybridization and number of d-electrons.

Which of the following complexes have a maximum number of unpaired electrons?

(a) $\left[\mathrm{Ni}\right(\mathrm{CO}{)}_4]$                                (b) $\left[\mathrm{Co}\right({\mathrm{NH}}_3{)}_4({\mathrm{NO}}_2{)}_2{]}^{+}$

(c) $\left[\mathrm{Ag}\right(\mathrm{CN}{)}_2{]}^{-}$                              (d) $[{\mathrm{CuBr}}_4{]}^{2-}$

The degeneracy of d-orbitals is lost under:

(I) Strong field ligand                 (II) Weak field ligand

(III) Mixed field ligand                 (IV) Chelate

Choose the correct code:

(1) I,II and IV                                 

(2) I and II

(3) I,II,III and IV                             

(4) I,II and III

Which of the following isomerism, exhibited by $\left[{\mathrm{CrCl}}_2\right(\mathrm{OH}{)}_2\left({\mathrm{NH}}_3{)}_2\right]$?

(1)Ionization     

(2) Geometrical

(3) Hydrate       

(4) Linkage

How many geometrical isomers and stereoisomers are possible for $\left[\mathrm{Pt}\right({\mathrm{NO}}_2\left)\right({\mathrm{NH}}_3\left)\right({\mathrm{NH}}_2\mathrm{OH}\left)\right(\mathrm{Py}){]}^{+ }\mathrm{and} [\mathrm{Pt}\left(\mathrm{Br}\right)\left(\mathrm{Cl}\right)\left(\mathrm{I}\right)\left({\mathrm{NO}}_2\right)\left({\mathrm{NH}}_3\right)\left(\mathrm{Py}\right)]$    respectively?

(a) 3 and 15                 (b)  3 and 30

(c) 4 and 15                  (d) 4 and 30 

 A compound that form two stereoisomer is -

(I) $\left[\mathrm{Cr}\right({\mathrm{NO}}_3{)}_3\left({\mathrm{NH}}_3{)}_3\right]$     

(II) ${\mathrm{K}}_3\left[\mathrm{Fe}\right({\mathrm{C}}_2{\mathrm{O}}_4{)}_3]$

(III) $\left[{\mathrm{CoCl}}_2\right(\mathrm{en}{)}_2{]}^{+}$       

(IV) $\left[\mathrm{CoBrCl}\right(\mathrm{ox}{)}_2{]}^{3-}$

(1)I only     

(2) I and II   

(3) III and IV   

(4) All of these