1
JEE Main 2021 (Online) 26th August Evening Shift
MCQ (Single Correct Answer)
+4
-1
Indicate the complex/complex ion which did not show any geometrical isomerism :
A
[CoCl2(en)2]
B
[Co(CN)5(NC)]3$$-$$
C
[Co(NH3)3(NO2)3]
D
[Co(NH3)4Cl2]+
2
JEE Main 2021 (Online) 26th August Evening Shift
MCQ (Single Correct Answer)
+4
-1
Arrange the following Cobalt complexes in the order of increasing Crystal Field Stabilization Energy (CFSE) value.

Complexes : $$\mathop {{{[Co{F_6}]}^{3 - }}}\limits_A ,\mathop {{{[Co{{({H_2}O)}_6}]}^{2 + }}}\limits_B ,\mathop {{{[Co{{(N{H_3})}_6}]}^{3 + }}}\limits_C and \mathop {{{[Co{{({en})}_3}]}^{3 + }}}\limits_D$$

Choose the correct option :
A
A < B < C < D
B
B < A < C < D
C
B < C < D < A
D
C < D < B < A
3
JEE Main 2021 (Online) 26th August Morning Shift
MCQ (Single Correct Answer)
+4
-1
Which one of the following complexes is violet in colour?
A
[Fe(CN)6]4$$-$$
B
[Fe(SCN)6]4$$-$$
C
Fe4[Fe(CN6)]3 . H2O
D
[Fe(CN)5NOS]4$$-$$
4
JEE Main 2021 (Online) 27th July Evening Shift
MCQ (Single Correct Answer)
+4
-1
Given below are two statements :

Statement I : $${[Mn{(CN)_6}]^{3 - }}$$, $${[Fe{(CN)_6}]^{3 - }}$$ and $${[Co{({C_2}{O_4})_3}]^{3 - }}$$ are d2sp3 hybridised.

Statement II : $${[MnCl)_6}{]^{3 - }}$$ and $${[Fe{F_6}]^{3 - }}$$ are paramagnetic and have 4 and 5 unpaired electrons, respectively.

In the light of the above statements, choose the correct answer from the options given below :
A
Statement I is correct but statement II is false
B
Both statement I and Statement II are false
C
Statement I is incorrect but statement II is true
D
Both statement I and statement II are true
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