1
MCQ (Single Correct Answer)

JEE Main 2019 (Online) 9th January Evening Slot

The complex that has highest crystal field splitting energy ($$\Delta $$), is :
A
[Co(NH3)5(H2O)]Cl3
B
K2[CoCl4]
C
[Co(NH3)5Cl]Cl2
D
K3[Co(CN)6]

Explanation

As complex K3[Co(CN)6] have CN$$-$$ ligand which is strongfield ligand amongst the given ligands in other complexes.
2
MCQ (Single Correct Answer)

JEE Main 2019 (Online) 9th January Evening Slot

Homoleptic octahedral complexes of a metal ion 'M3+' with three monodenate ligands L1, L2 and L3 adsorb wavelenths in the region of green, blue and red respectively. The increasing order of the ligands strength is :
A
L3 < L1 < L2
B
L3 < L2 < L1
C
L1 < L2 < L3
D
L2 < L1 < L3

Explanation

Stronger the ligand, absorption of light having lower wavelength is more.

Order of $$\lambda $$ : Red $$>$$ Green $$>$$ Blue

Hence, ligand strength is L3 $$<$$ L1 $$<$$ L2
3
MCQ (Single Correct Answer)

JEE Main 2019 (Online) 10th January Morning Slot

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

Explanation

Then is no catalyst is required for combustion of coal.
4
MCQ (Single Correct Answer)

JEE Main 2019 (Online) 10th January Morning Slot

The total number of isomers for a square planar complex
[M(F)(Cl)(SCN)(NO2)] is
A
16
B
8
C
12
D
4

Explanation



So, The total number of isomers for a square planar complex [M(F)(Cl)(SCN)(NO2 )] is 12

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