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1
JEE Main 2021 (Online) 27th August Evening Shift
MCQ (Single Correct Answer)
+4
-1
The addition of dilute NaOH to Cr3+ salt solution will give :
A
a solution of [Cr(OH)4]$$-$$
B
precipitate of Cr2O3(H2O)n
C
precipitate of [Cr(OH)6]3$$-$$
D
precipitate of Cr(OH)3
2
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]+
3
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
4
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$$-$$
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