MCQ
Which of the following is paramagnetic
- A$\left[ {Ni{{\left( {CO} \right)}_4}} \right]$
- B${[Co{(N{H_3})_6}]^{3 + }}$
- C${\left[ {Ni{{\left( {CN} \right)}_4}} \right]^{2 - }}$
- ✓${\left[ {NiC{l_4}} \right]^{2 - }}$
✓
Answer
Correct option: D.
${\left[ {NiC{l_4}} \right]^{2 - }}$
d
In $N i(C O)_{4},$ the oxidation state of $N i$ is zero whereas in $\left[N i C l_{4}\right]^{2-}$, the oxidation state of $N i$ is. The presence of $C O$ ligand, which is a strong ligand, can pair all electrons in $N i(C O)_{4}$ and thus it is diamagnetic in nature but $C l^{-}$ is a weak ligand and is unable to pair up the unpaired electrons and thus $\left[ NiCl _{4}\right]^{2-}$ is paramagnetic in nature.
In $N i(C O)_{4},$ the oxidation state of $N i$ is zero whereas in $\left[N i C l_{4}\right]^{2-}$, the oxidation state of $N i$ is. The presence of $C O$ ligand, which is a strong ligand, can pair all electrons in $N i(C O)_{4}$ and thus it is diamagnetic in nature but $C l^{-}$ is a weak ligand and is unable to pair up the unpaired electrons and thus $\left[ NiCl _{4}\right]^{2-}$ is paramagnetic in nature.
Need a full question paper?
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Explore more
Similar questions
In osmosis reaction, the volume of solution
Which oxide will not given metal on heating:-
$C_6H_6$ $\xrightarrow[{(ii)\,\,Zn - Hg\,/\,HCl}]{{(i)\,\,C{H_3}COCl\,/\,AlC{l_3}}}$ $(P)$ $\xrightarrow[{(ii)\,\,{H_2}O/{K_2}C{O_3}}]{{(i)\,\,NBS}}(Q)$
→Major product $(Q)$ of following sequence is
Propene, $C{H_3} - CH = C{H_2}$ can be converted to $1-$ propanol by oxidation. Which set of reagents among the following is ideal to effect the conversion
→$R - OH + HX \to R - X + {H_2}O$ In the above reaction, the reactivity of different alcohols is
→Product $C$ is
→Arrange given amines in decreasing order of their basicity?
Match List $I$ with List $II$
→| List $I$ Name of reaction | List $II$ Reagent used |
| $A$ Hell-Volhard-Zelinsky reaction | $I$ $NaOH + I _2$ |
| $B$ Iodoform reaction | $II$ (i) $CrO _2 Cl _2, CS _2$ (ii)$H _2 O$ |
| $C$ Etard reaction | $III$ (i) $Br _2 /$ red phosphorus (ii) $H _2 O$ |
| $D$ Gatterman-Koch reaction | $IV$ $CO , HCl$, anhyd.$AlCl_3$ |
Choose the correct answer from the options given below:
Rare-earth elements are exhibited by
If the standard reduction potential for four divalent elements $X,\, Y, \,Z,\, W$ are $-1.46\, V,\, -0.36V,\,0.15\, V$ and $-1.24\, V$ respectively, then :-
→