Among the following complexes (i) K3[Fe(CN)6],(ii) [Co(NH3)6]Cl3, (iii) Na3[Co(ox)3], (iv) [Ni(H2O)6]Cl2 (v) K2[Pt(CN)4] and (vi) [Zn(H2O)6(NO3)2] the diamagnetic complexes are

Question

Among the following complexes (i) K3[Fe(CN)6],(ii) [Co(NH3)6]Cl3, (iii) Na3[Co(ox)3], (iv) [Ni(H2O)6]Cl2 (v) K2[Pt(CN)4] and (vi) [Zn(H2O)6(NO3)2] the diamagnetic complexes are (A) (i), (ii), (iii), (iv) (B) (i), (iii), (v), (vi) (C) (ii), (iii), (v), (vi) (D) (ii), (iii), (iv), (v)

Tardigrade Admin · Accepted Answer

Due to the absence of unpaired electrons,

[C o (N H_{3})_{6}] C l_{3}, N a_{3} [C o (o x)_{3}]

for a diamagnetic complex, there should not be unpaired electron in the valence shell of central metal.,

[Z n (H_{2} O)_{6}] (N O_{3})_{2}

and

K_{2} [Pt (CN)_{4}]

are diamagnetic complexes.
for In

K_{3} [F e (CN)_{6}], F e^{3 +}

is

d^{2} s p^{3}

hybridised and it has one unpaired electron. It is paramagnetic.

[N i (H_{2} O)_{6}] C l_{2}

is octahedral, outer orbital complex in which

N i^{2 +}

is paramagnetic. For a diamagnetic complex, there should not be any unpaired electron in the valence shell of central metal.
In

K_{3} [F e (CN)_{6}]

Fe (III) has

d^{5} -

-configuration (odd electrons), hence it is paramagnetic.
In

[C o (N H_{3})_{6}] C l_{3}, C o

(III) has

d^{6} -

configuration in a strong ligand field, hence all the electrons are paired and the complex is diamagnetic.
In

N a_{3} [C o (o x)_{3}], C o

(III) has

d^{6} -

-configuration and oxalate being a chelating ligand, very strong ligand and all the six electrons remains paired in lower

t_{2 g}

level, diamagnetic.
In

[N i (H_{2} O)_{6} C l_{2}, N i (II)

has

3 d^{8} -

configuration and

H_{2} O

is a weak ligand, hence
In

K_{2} [Pt (CN)_{4}], Pt (II) ha s d^{8} -

configuration and

C N^{-}

is a strong ligand, hence all the eight electrons are spin paired. Therefore,
complex is diamagnetic.
In

[Z n (H_{2} O)_{6}] (N O_{3})_{2}, Z n (II)

has 3d^{10} $ configuration with all the ten electrons spin paired, hence diamagnetic.

Q. Among the following complexes (i)K3​[Fe(CN)6​],(ii)[Co(NH3​)6​]Cl3​, (iii)Na3​[Co(ox)3​],(iv)[Ni(H2​O)6​]Cl2​ (v)K2​[Pt(CN)4​] and (vi)[Zn(H2​O)6​(NO3​)2​] the diamagnetic complexes are

(i), (ii), (iii), (iv)

(i), (iii), (v), (vi)

(ii), (iii), (v), (vi)

(ii), (iii), (iv), (v)

Q. Among the following complexes
$(i) K_{3} [F e (CN)_{6}], (ii) [C o (N H_{3})_{6}] C l_{3},$
$(iii) N a_{3} [C o (o x)_{3}], (i v) [N i (H_{2} O)_{6}] C l_{2}$
$(v) K_{2} [Pt (CN)_{4}]$ and $(v i) [Z n (H_{2} O)_{6} (N O_{3})_{2}]$
the diamagnetic complexes are