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Question: 1 ) Among the following complexes (K-P) K3[Fe(CN)6] (K), [Co(NH3)6]Cl3 (L),  Na3[Co(Oxalate)3] (M), [Ni(H2O)6]Cl2 (N), K2[Pt(CN)6] (O) and [Zn(H2O)6](NO3)2 (P). The diamagnetic complexes are  (IIT JEE -2012)

1) K, L, M, N

2) K, M, O, P

3) L, M, O ,P

4) L, M ,N ,O

Answer: C

Solution:

Complex

MetalIon

system

Complex Spin

Electronic Configuration

No. of Unpaired electrons

Magnetic Property

K3[Fe(CN)6]

Fe(III)

d5

Low Spin

t2g5 eg0

1

Paramagnetic

[Co(NH3)6]Cl3

Co(III)

d6

Low Spin

t2g6 eg0

0

Diamagnetic

Na3[Co(Oxalate)3]

Co(III)

d6

Low Spin

t2g6 eg0

0

Diamagnetic

[Ni(H2O)6]Cl2

Ni(II)

d8

High Spin

t2g6 eg2

2

Paramagnetic

K2[Pt(CN)6]

Pt(IV)

d6

Low Spin

t2g6 eg0

0

Diamagnetic

[Zn(H2O)6](NO3)2

Zn(II)

d10

Low Spin

t2g6 eg4

0

Diamagnetic

Hence, the correct option is C.

Question: 2 ) As per IUPAC nomenclature, the name of the complex [Co(H2O)4(NH3)2]Cl3 is     

1) Tetraaquadiaminecobalt (III) chloride.

2) Tetraaquadiamminecobalt (III) chloride.

3) Diaminetetraaquacobalt (III) chloride.

4) Diamminetetraaquacobalt (III) chloride.  (IIT JEE -2012)

Answer: D

Solution:

The compound contains 4 H2O ligand and 2 NH3 ligand. Both of these are neutral so there names

would be used as such without adding any prefix of suffix. i.e. aqua and ammine.

Acording to alphabetical order ammine would come before aqua.

So, the IUPAC name is  Diamminetetraaquacobalt (III) chloride.

Hence, the correct option is d.

Question 3) Geometrical shapes of the complexes formed by the reaction of Ni2+ with Cl-, CN- and H2O, respectively are  (IIT JEE  2011)

1) octahedral, tetrahedral and square planar.

2) tetrahedral, square planar and octahedral.

3) square planar, tetrahedral and octahedral.

4) octahedral, square planar and octahedral.

Answer: b

Solution

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