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JEE Main Mock Test Series 2020 & Previous Year Papers

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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)
(a) K, L, M, N
(b) K, M, O, P
(c) L, M, O ,P
(d) L, M ,N ,O
Answer: c
Solution:

Complex
MetalIon
system
Complex Spin
Electronic Configuration
No. of Unpairedelectrons
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     
(a) Tetraaquadiaminecobalt (III) chloride.
(b) Tetraaquadiamminecobalt (III) chloride.
(c) Diaminetetraaquacobalt (III) chloride.
(d) 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.
According 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)
(a) octahedral, tetrahedral and square planar.
(b) tetrahedral, square planar and octahedral.
(c) square planar, tetrahedral and octahedral.
(d) octahedral, square planar and octahedral.
Answer: b
Solution

Metal Ion
Ligand
Complex
Geometry
Ni2+
Cl-
[NiCl4]2-
Tetrahedral
Ni2+
CN-
[Ni(CN)4]2-
Square Planar
Ni2+
H2O
[Ni(H2O)6]2+
Octahedral

Hence, the correct option is B.

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