1
MCQ (Single Correct Answer)

JEE Main 2018 (Online) 15th April Evening Slot

The correct order of spin-only magnetic moments among the following is :
(Atomic number : Mn = 25, Co = 27, Ni = 28, Zn = 30)
A
[ZnCl4]2- > [NiCl4]2- > [CoCl4]2- > [MnCl4]2-
B
[CoCl4]2- > [MnCl4]2- > [NiCl4]2- > [ZnCl4]2-
C
[NiCl4]2- > [CoCl4]2- > [MnCl4]2- > [ZnCl4]2-
D
[MnCl4]2- > [CoCl4]2- > [NiCl4]2- > [ZnCl4]2-

Explanation

We know,

Spin only magnetic moment ($$\mu $$) = $$\sqrt {n\left( {n + 2} \right)} $$   B.M

Where, n is the number of unpaired electrons.

So, the complex having higher number of unpaired electrons will have higher value of spin only magnetic moment.

(1)   Zn+2 : [Ar] 3d10
Here 0 unpaired electrons present

(2)   Ni+2 : [Ar] 3d8
Here 2 unpaired electrons present.

(3)   Co+2 : [Ar] 3d7
Here 3 unpaired electrons present.

(4)   Mn+2 : [Ar] 3d5
Here 5 unpaired electrons present.

So, correct order is $$ \to $$
    [MnCl4]2$$-$$ > [CoCl4]2$$-$$ > [NiCl4]2$$-$$ > [ZnCl4]2$$-$$
2
MCQ (Single Correct Answer)

JEE Main 2018 (Online) 15th April Evening Slot

The total number of possible isomers for square-planar [Pt(Cl)(NO2)(NO3)(SCN)]2- is :
A
8
B
12
C
16
D
24
3
MCQ (Single Correct Answer)

JEE Main 2018 (Online) 16th April Morning Slot

In Wilkinson's catalyst, the hybridization of central metal ion and its shape are respectively :
A
sp3d, trigonal bipyramidal
B
sp3, tetrahedral
C
dsp2, square planar
D
d2sp3, octahedral

Explanation

Wilkinson's catalyst is [RhCl(PPh3)3]

Here central atom is Rh.

Oxidation state of Rh here is = + 1

$$ \therefore $$   Electronic configuration of Rh+ = [Kr]4d8


And the complex is square planar

4
MCQ (Single Correct Answer)

JEE Main 2018 (Online) 16th April Morning Slot

Which of the following complexes will shows geometrical isomerism ?
A
aquachlorobis (ethylenediamine) cobalt (II) chloride
B
pentaaquachlorohromium (III) chloride
C
potassium amminetrichloropltinate (II)
D
potassium tris(oxalato) chromate (III)

Explanation

(a)   [Co(H2O) Cl(en)2]Cl  $$ \to $$  it shows gemetrical isomerism.



(b)   [Cr(H2O)5Cl]Cl2  :   This complex is [MA5B] type. It does not show geometrical isomerism.

(c)   K[Pt(NH3)Cl3]  :  Thiscomplex is [MAB3] type. It does not show geometrical isomerism.

(d)   K3[Cr(OX)3]  :  This complex is [M(AA)3] type. It does not show geometrical isomerism.

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