1
JEE Main 2023 (Online) 10th April Morning Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

The octahedral diamagnetic low spin complex among the following is :

A
[Co(NH$$_3$$)$$_6$$]$$^{3+}$$
B
[NiCl$$_4$$]$$^{2-}$$
C
[CoCl$$_6$$]$$^{3-}$$
D
[CoF$$_6$$]$$^{3-}$$
2
JEE Main 2023 (Online) 8th April Evening Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

Match List I with List II

LIST I
Coordination Complex
LIST II
Number of unpaired electrons
A. $$\left[\mathrm{Cr}(\mathrm{CN})_{6}\right]^{3-}$$ I. 0
B. $$\left[\mathrm{Fe}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right]^{2+}$$ II. 3
C. $$\left[\mathrm{Co}\left(\mathrm{NH}_{3}\right)_{6}\right]^{3+}$$ III. 2
D. $$\left[\mathrm{Ni}\left(\mathrm{NH}_{3}\right)_{6}\right]^{2+}$$ IV. 4

Choose the correct answer from the options given below:

A
A-IV, B-III, C-II, D-I
B
A-II, B-I, C-IV, D-III
C
A-II, B-IV, C-I, D-III
D
A-III, B-IV, C-I, D-II
3
JEE Main 2023 (Online) 8th April Morning Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

Which of the following complex is octahedral, diamagnetic and the most stable?

A
$$\mathrm{Na}_{3}\left[\mathrm{CoCl}_{6}\right]$$
B
$$\left[\mathrm{Co}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right] \mathrm{Cl}_{2}$$
C
$$\mathrm{K}_{3}\left[\mathrm{Co}(\mathrm{CN})_{6}\right]$$
D
$$\left[\mathrm{Ni}\left(\mathrm{NH}_{3}\right)_{6}\right] \mathrm{Cl}_{2}$$
4
JEE Main 2023 (Online) 8th April Morning Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

The correct order of spin only magnetic moments for the following complex ions is

A
$$\left[\mathrm{Fe}(\mathrm{CN})_{6}\right]^{3-}<\left[\mathrm{CoF}_{6}\right]^{3-}<\left[\mathrm{MnBr}_{4}\right]^{2-}<\left[\mathrm{Mn}(\mathrm{CN})_{6}\right]^{3-}$$
B
$$\left[\mathrm{MnBr}_{4}\right]^{2-}<\left[\mathrm{CoF}_{6}\right]^{3-}<\left[\mathrm{Fe}(\mathrm{CN})_{6}\right]^{3-}<\left[\mathrm{Mn}(\mathrm{CN})_{6}\right]^{3-}$$
C
$$\left[\mathrm{Fe}(\mathrm{CN})_{6}\right]^{3-}<\left[\mathrm{Mn}(\mathrm{CN})_{6}\right]^{3-}<\left[\mathrm{CoF}_{6}\right]^{3-}<\left[\mathrm{MnBr}_{4}\right]^{2-}$$
D
$$\left[\mathrm{CoF}_{6}\right]^{3-}<\left[\mathrm{MnBr}_{4}\right]^{2-}<\left[\mathrm{Fe}(\mathrm{CN})_{6}\right]^{3-}<\left[\mathrm{Mn}(\mathrm{CN})_{6}\right]^{3-}$$
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