A complex with the composition $[{\mathrm{MA}}_3\mathrm{B}{]}^{\mathrm{n}\pm }$ is found to have no geometrical isomers. The possible structures (s) of the complex is (Where A and B are monodentate ligands)

(1) Tetrahedral                   

(2) Square planar

(3) Both (a) and (b)             

(4) Cannot be predicted

Complexes formed in the following methods are:

(I) Mond's process for purification of nickel

(II) Removal of unreacted AgBr from photographic plate

(III) Removal of lead poisoning from the body

Options are as follows: 

$\mathrm{I} \mathrm{II} \mathrm{III}$
$\left(\mathrm{a}\right) \mathrm{Ni}(\mathrm{CO}{)}_{4 } [\mathrm{Ag}(\mathrm{CN}{)}_2{]}^{-} [\mathrm{Pb}\left(\mathrm{EDTA}\right){]}^{2-}$
$\left(\mathrm{b}\right) \mathrm{Ni}(\mathrm{CO}{)}_4 [\mathrm{Ag}({\mathrm{S}}_2{\mathrm{O}}_3{)}_2{]}^{3- } [\mathrm{Pb}\left(\mathrm{EDTA}\right){]}^{2-}$
$\left(\mathrm{c}\right) \mathrm{Ni}(\mathrm{CO}{)}_6 [\mathrm{Ag}\left({\mathrm{S}}_2{\mathrm{O}}_3\right){]}^{3-} \left[\mathrm{Pb}\right(\mathrm{EDTA}){]}^{4-}$
$\left(\mathrm{d}\right) \mathrm{Ni}(\mathrm{CO}{)}_6 [\mathrm{Ag}\left({\mathrm{S}}_2{\mathrm{O}}_3\right){]}^{-} \left[\mathrm{Pb}\right(\mathrm{EDTA}){]}^{4-}$
$$

The correct name for the complex ion $\left[\mathrm{CoCl}\right(\mathrm{ONO}\left)\right(\mathrm{en}{)}_2{]}^{+}$ is:

1. chlorobis(ethylenediamine)nitrito-O-cobaltate(III) ion

2. chlorodiethyldiaminenitrito-O-cobalt(III) ion

3. chloronitrito-O-diethyldiamine cobaltate (III) ion

4. chlorobis (ethylenediamine)nitrito-O-cobalt (III) ion

Which of the following ligand does not as $\mathrm{\pi }$-acid ligand?

(a) ${\mathrm{N}}_2$           (b) CO              (c) ${\mathrm{C}}_2{\mathrm{H}}_4$                 (d) ${\mathrm{O}}_2^{2-}$

$\left[\mathrm{Mn}\right(\mathrm{CO}{)}_4\mathrm{NO}]$ is diamagnetic because:

1. Mn metal is paramagnetic in free state

2. Mn is in +1 oxidation state in this complex

3. NO is present as positive ligand

4. All of the above

Choose the correct option regarding the following complex compound which follows (F) and does not follow (NF) the Sidgwick EAN rule:

(I) $\left[\right({\mathrm{Ph}}_3\mathrm{P}{)}_2{\mathrm{PdCl}}_2{\mathrm{PdCl}}_2]$                     (II) $\left[\mathrm{NiBrCl}\right(\mathrm{en}\left)\right]$

(III) ${\mathrm{Na}}_4\left[\mathrm{Fe}\right(\mathrm{CN}{)}_5\mathrm{NOS}]$                       (IV) $\mathrm{Cr}\left(\mathrm{CO}{)}_3\right(\mathrm{NO}{)}_2$

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

(a)    NF   NF      NF       NF                 (b)    F       F        NF        F

(c)     NF   NF      F          F                  (d)   NF      NF      F          NF 

Which of the following species can act as reducing agent ?

(1) $\left[\mathrm{Co}\right(\mathrm{CO}{)}_4{]}^{-}$     

(2) $\mathrm{Mn}(\mathrm{CO}{)}_6$       

(3) $\mathrm{Mn}(\mathrm{CO}{)}_5$       

(4) $\mathrm{Cr}(\mathrm{CO}{)}_6$

The electronic arrangement of an octahedral complex with a ${\mathrm{d}}^4$ configuration, if ∆₀ < pairing energy is:

1. ${\mathrm{t}}_{2\mathrm{g}}^4{\mathrm{e}}_{\mathrm{g}}^0$                       

2. ${\mathrm{e}}_{\mathrm{g}}^4{\mathrm{t}}_{2\mathrm{g}}^0$               

3. ${\mathrm{t}}_{2\mathrm{g}}^3{\mathrm{e}}_{\mathrm{g}}^1$           

4. ${\mathrm{e}}_{\mathrm{g}}^2{\mathrm{t}}_{2\mathrm{g}}^2$

Which of the following statement is not correct ?

(a) Bis(glycinato)Zinc(II) is optically active

(b) $[{\mathrm{NiCl}}_4{]}^{2- }\mathrm{and} [{\mathrm{PtCl}}_4{]}^{2-}$ have different shape

(c) $\left[\mathrm{Ni}\right(\mathrm{CN}{)}_4{]}^{4-}$ is square planar complex

(d) $\left[\mathrm{Ni}\right(\mathrm{CN}{)}_4{]}^{2- }\mathrm{and} \left[\mathrm{Ni}\right(\mathrm{CO}{)}_4]$ have the same magnetic moment

Give the correct of initial T or F for following statements. Use T is statement is true and F if it is false

(I) Co(III) is stabilised in presence of weak ligands , while Co(II) is stabilised in presence of strong field ligand.

(II) Four coordinated complexes of Pd(II) and Pt(II) are diamagnetic and square planar.

(III) $\left[\mathrm{Ni}\right(\mathrm{CN}{)}_4{]}^{4-}$ ion and $\left[\mathrm{Ni}\right(\mathrm{CO}{)}_4]$ are diamagnetic tetrahedral and square planar.

(IV) ${\mathrm{Ni}}^{2+}$ ion does not form inner orbital octahedral complexes.

(1) TFTF                                   

(2) TTTF

(3) TTFT                                   

(4) FTFT