1
MCQ (Single Correct Answer)

JEE Main 2019 (Online) 10th January Evening Slot

The difference in the number of unpaired electrons of a metal ion in its high spin and low-spin octahedral complexes is two. The metal ion is -
A
Mn2+
B
Ni2+
C
Co2+
D
Fe2+

Explanation


$$ \therefore $$ The difference in the number of unpaired electrons = 3 - 1 = 2
2
MCQ (Single Correct Answer)

JEE Main 2019 (Online) 11th January Morning Slot

Match the metals (column I) with the coordination compound(s)/enzyme(s) (column II)

(Column I) Metals
(Column II) Coordination
compounds(s) enzyme(s)
(A) Co (i) Wilkinson catalyst
(B) Zn (ii) Chlorophyl
(C) Rh (iii) Vitamin B12
(D) Mg (iv) Carbonic anhydrase
A
(A)-(iii); (B)-(iv); (C)-(i); (D)-(ii)
B
(A)-(iv); (B)-(iii); (C)-(i); (D)-(ii)
C
(A)-(i); (B)-(ii); (C)-(iii); (D)-(iv)
D
(A)-(ii); (B)-(i); (C)-(iv); (D)-(iii)

Explanation

Co $$ \to $$ Vitamin B12

Zn $$ \to $$ Carbonic anhydrase

Rh $$ \to $$ Wilkinson catalyst

Mg $$ \to $$ Chlorophyll
3
MCQ (Single Correct Answer)

JEE Main 2019 (Online) 11th January Evening Slot

The number of bridging CO ligand(s) and Co-Co bond(s) in Co2(CO)8, respectively are :
A
2 and 0
B
0 and 2
C
4 and 0
D
2 and 1

Explanation

4
MCQ (Single Correct Answer)

JEE Main 2019 (Online) 11th January Evening Slot

The coordination number of Th in K4[Th(C2O4)4(OH2)2] is :
(C2O$${_4^{2 - }}$$ = Oxalato)
A
14
B
10
C
8
D
6

Explanation

Oxalato (C2O42–) is a bidentate and H2O is unidentate ligand.

4C2O42– creates 8 covalent bonds.

2H2O creates 2 covalent bonds.

$$ \therefore $$ Around Th 10 coordinate covalent bonds will be present.

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