1
JEE Main 2025 (Online) 22nd January Morning Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

From the magnetic behaviour of $\left[\mathrm{NiCl}_4\right]^{2-}$ (paramagnetic) and $\left[\mathrm{Ni}(\mathrm{CO})_4\right]$ (diamagnetic), choose the correct geometry and oxidation state.

A
$\left[\mathrm{NiCl}_4\right]^{2-}: \mathrm{Ni}(0)$, tetrahedral $\left[\mathrm{Ni}(\mathrm{CO})_4\right]: \mathrm{Ni}(0)$, square planar
B
$\left[\mathrm{NiCl}_4\right]^{2-}: \mathrm{Ni}^{\mathrm{II}}$, tetrahedral $\left[\mathrm{Ni}(\mathrm{CO})_4\right]: \mathrm{Ni}(0)$, tetrahedral
C
$\left[\mathrm{NiCl}_4\right]^{2-}: \mathrm{Ni}^{\mathrm{II}}$, tetrahedral $\left[\mathrm{Ni}(\mathrm{CO})_4\right]: \mathrm{Ni}^{I I}$, square planar
D
$\left[\mathrm{NiCl}_4\right]^{2-}: \mathrm{Ni}^{\mathrm{II}}$, square planar $\left[\mathrm{Ni}(\mathrm{CO})_4\right]: \mathrm{Ni}(0)$, square planar
2
JEE Main 2025 (Online) 22nd January Morning Shift
MCQ (Single Correct Answer)
+4
-1
Change Language
 

In which of the following complexes the CFSE, $\Delta_o$ will be equal to zero?

A
$\mathrm{K}_3\left[\mathrm{Fe}(\mathrm{SCN})_6\right]$
B
$\left[\mathrm{Fe}(\mathrm{en})_3\right] \mathrm{Cl}_3$
C
$\left[\mathrm{Fe}\left(\mathrm{NH}_3\right)_6\right] \mathrm{Br}_2$
D
$\mathrm{K}_4\left[\mathrm{Fe}(\mathrm{CN})_6\right]$
3
JEE Main 2024 (Online) 9th April Evening Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

Match List I with List II

LIST I LIST II
A. $$\mathrm{K}_2\left[\mathrm{Ni}(\mathrm{CN})_4\right]$$ I. $$sp^3$$
B. $$\left[\mathrm{Ni}(\mathrm{CO})_4\right]$$ II. $$sp^3d^2$$
C. $$\left[\mathrm{Co}\left(\mathrm{NH}_3\right)_6\right] \mathrm{Cl}_3$$ III. $$dsp^2$$
D. $$\mathrm{Na}_3\left[\mathrm{CoF}_6\right]$$ IV. $$d^2sp^3$$

Choose the correct answer from the options given below:

A
A-III, B-II, C-IV, D-I
B
A-III, B-I, C-II, D-IV
C
A-I, B-III, C-II, D-IV
D
A-III, B-I, C-IV, D-II
4
JEE Main 2024 (Online) 9th April Evening Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

The coordination environment of $$\mathrm{Ca}^{2+}$$ ion in its complex with $$\mathrm{EDTA}^{4-}$$ is :

A
trigonal prismatic
B
octahedral
C
square planar
D
tetrahedral
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