JEE Main 2025 (Online) 22nd January Evening Shift | Coordination Compounds Question 15 | Chemistry

1

JEE Main 2025 (Online) 22nd January Evening Shift

MCQ (Single Correct Answer)

+4

-1

Identify the homoleptic complex(es) that is/are low spin.

(A) $\left[\mathrm{Fe}(\mathrm{CN})_5 \mathrm{NO}\right]^{2-}$

(B) $\left[\mathrm{CoF}_6\right]^{3-}$

(C) $\left[\mathrm{Fe}(\mathrm{CN})_6\right]^{4-}$

(D) $\left[\mathrm{Co}\left(\mathrm{NH}_3\right)_6\right]^{3+}$

(E) $\left[\mathrm{Cr}\left(\mathrm{H}_2 \mathrm{O}\right)_6\right]^{2+}$

Choose the correct answer from the options given below :

A

(C) and (D) only

B

(C) only

C

(A) and (C) only

D

(B) and (E) only

2

JEE Main 2025 (Online) 22nd January Morning Shift

MCQ (Single Correct Answer)

+4

-1

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

3

JEE Main 2025 (Online) 22nd January Morning Shift

MCQ (Single Correct Answer)

+4

-1

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

$\mathrm{K}_4\left[\mathrm{Fe}(\mathrm{CN})_6\right]$

4

JEE Main 2024 (Online) 9th April Evening Shift

MCQ (Single Correct Answer)

+4

-1

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