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1
JEE Main 2019 (Online) 11th January Morning Slot
MCQ (Single Correct Answer)
+4
-1
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)
2
JEE Main 2019 (Online) 10th January Evening Slot
MCQ (Single Correct Answer)
+4
-1
A reaction of cobalt (III) chloride and ethylenediamine in a 1 : 2 mole ratio generates two isomeric products A (violet coloured) and B (green coloured). A can show optical activity, but B is optically inactive. What type of isomers does A and B represcent ?
A
Ionisation isomers
B
Linkage isomers
C
Coordination isomers
D
Geometrical isomers
3
JEE Main 2019 (Online) 10th January Evening Slot
MCQ (Single Correct Answer)
+4
-1
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+
4
JEE Main 2019 (Online) 10th January Morning Slot
MCQ (Single Correct Answer)
+4
-1
Which of the following is not an example of heterogenous catalytic reaction ?
A
Ostwald's process
B
Combustion of coal
C
Hydrogenation of vegetable oils
D
Haber's process
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