Question

Simplified absorption spectra of three complexes ((i) and (ii) and (iii)) of ${\mathrm{M}}^{+\mathrm{n}}$ ion are provided below; their ${\lambda }_{\max }$ values are marked as $\mathrm{A}, \mathrm{B}$ and $\mathrm{C}$ respectively. The correct match between the complexes and their ${\lambda }_{\max }$ values is:

(i) ${\left[\mathrm{M}(\mathrm{NCS}{)}_6\right]}^{(-6+\mathrm{n})}$
(ii) ${\left[{\mathrm{MF}}_6\right]}^{(-6+\mathrm{n})}$
(iii) ${\left[\mathrm{M}{\left({\mathrm{NH}}_3\right)}_6\right]}^{\mathrm{n}+}$

JEE Main 2020 (02 Sep Shift 2)

Options

• A: $\mathrm{A}-\left(\mathrm{iii}\right), \left(\mathrm{B}\right)-\left(\mathrm{i}\right), \mathrm{C}-\left(\mathrm{ii}\right)$
• B: $\mathrm{A}-\left(\mathrm{ii}\right), \left(\mathrm{B}\right)-\left(\mathrm{i}\right), \mathrm{C}-\left(\mathrm{iii}\right)$
• C: $\mathrm{A}-\left(\mathrm{ii}\right), \left(\mathrm{B}\right)-\left(\mathrm{iii}\right), \mathrm{C}-\left(\mathrm{i}\right)$
• D: $\mathrm{A}-\left(\mathrm{i}\right), \left(\mathrm{B}\right)-\left(\mathrm{ii}\right), \mathrm{C}-\left(\mathrm{iii}\right)$

Question

The complex that can show optical activity is :

JEE Main 2020 (03 Sep Shift 1)

Options

• A: $trans-{\left[Cr\left({\mathrm{Cl}}_2\right)(\mathrm{Ox}{)}_2\right]}^{3-}$
• B: $\mathrm{trans}-{\left[\mathrm{Fe}{\left({\mathrm{NH}}_3\right)}_2{\left(\mathrm{CN}\right)}_4\right]}^{-}$
• C: $cis-{\left[\mathrm{Fe}{\left({\mathrm{NH}}_3\right)}_2(\mathrm{CN}{)}_4\right]}^{-}$
• D: $\mathrm{cis}-{\left[{\mathrm{CrCl}}_2{\left(\mathrm{ox}\right)}_2\right]}^{3-}\left(\mathrm{ox}=\mathrm{oxalate}\right)$

Question

The d-electron configuration of $\left[\mathrm{Ru}(\mathrm{en}{)}_3\right]{\mathrm{Cl}}_2$, and $\left[\mathrm{Fe}{\left({\mathrm{H}}_2\mathrm{O}\right)}_6\right]{\mathrm{Cl}}_2$ respectively are:

JEE Main 2020 (03 Sep Shift 2)

Options

• A: ${\mathrm{t}}_{2\mathrm{g}}^6{\mathrm{e}}_{\mathrm{g}}^0 \mathrm{and} {\mathrm{t}}_{2\mathrm{g}}^6{\mathrm{e}}_{\mathrm{g}}^0$
• B: ${\mathrm{t}}_{2\mathrm{g}}^4{\mathrm{e}}_{\mathrm{g}}^2 \mathrm{and} {\mathrm{t}}_{2\mathrm{g}}^6{\mathrm{e}}_{\mathrm{g}}^0$
• C: ${\mathrm{t}}_{2\mathrm{g}}^6{\mathrm{e}}_{\mathrm{g}}^0 \mathrm{and} {\mathrm{t}}_{2\mathrm{g}}^4{\mathrm{e}}_{\mathrm{g}}^2$
• D: ${\mathrm{t}}_{2\mathrm{g}}^4{\mathrm{e}}_{\mathrm{g}}^2 \mathrm{and} {\mathrm{t}}_{2\mathrm{g}}^4{\mathrm{e}}_{\mathrm{g}}^2$

Question

The number of isomers possible for $\left[\mathrm{Pt}\left(\mathrm{en}\right){\left({\mathrm{NO}}_2\right)}_2\right]$ is:

JEE Main 2020 (04 Sep Shift 1)

Options

• A: $2$
• B: $4$
• C: $1$
• D: $3$

Question

Consider the complex ions, trans- ${\left[\mathrm{Co}(\mathrm{en}{)}_2{\mathrm{Cl}}_2\right]}^{*}\left(\mathrm{A}\right)$ and $\mathrm{cis}-{\left[\mathrm{Co}(\mathrm{en}{)}_2{\mathrm{Cl}}_2\right]}^{+}\left(\mathrm{B}\right).$ The correct statement regarding them is :

JEE Main 2020 (05 Sep Shift 2)

Options

• A: both (A) and (B) cannot be optically active.
• B: (A) can be optically active, but (B) cannot be optically active.
• C: both (A) and (B) can be optically active.
• D: (A) cannot be optically active, but (B) can be optically active.

Question

For a ${\mathrm{d}}^4$ metal ion in an octahedral field, the correct electronic configuration is :

JEE Main 2020 (06 Sep Shift 2)

Options

• A: ${\mathrm{t}}_{2_{\mathrm{g}}}^3 {\mathrm{e}}_{\mathrm{g}}^1$ when ${∆}_{\mathrm{O}}<\mathrm{P}$
• B: ${\mathrm{t}}_{2_{\mathrm{g}}}^3 {\mathrm{e}}_{\mathrm{g}}^1$ when ${∆}_{\mathrm{O}}>\mathrm{P}$
• C: ${\mathrm{t}}_{2_{\mathrm{g}}}^4 {\mathrm{e}}_{\mathrm{g}}^0$ when ${∆}_{\mathrm{O}}<\mathrm{P}$
• D: ${\mathrm{e}}_{\mathrm{g}}^2 {\mathrm{t}}_{2_{\mathrm{g}}}^2$ when ${∆}_{\mathrm{O}}<\mathrm{P}$

Question

The total number of coordination sites in ethylenediaminetetraacetate ( ${\mathrm{EDTA}}^{4-}$) is ...................

JEE Main 2020 (05 Sep Shift 1)

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Question

The Crystal Field Stabilization Energy (CFSE) and magnetic moment (spin-only) of an octahedral aqua complex of a metal ion $\left({\mathrm{M}}^{Z+}\right)$ are $-0.8{\mathrm{\Delta }}_0$ and $3.87$ $\mathrm{BM}$, respectively. Identify $\left({\mathrm{M}}^{Z+}\right):$

JEE Main 2021 (01 Sep Shift 2)

Options

• A: ${\mathrm{V}}^{3+}$
• B: ${\mathrm{Co}}^2+$
• C: ${\mathrm{Cr}}^{3+}$
• D: ${\mathrm{Mn}}^{4+}$

Question

Arrange the following metal complex/ compounds in the increasing order of spin only magnetic moment. Presume all the three, high spin system.

(Atomic numbers $\mathrm{Ce}=58, \mathrm{Gd}=64$ and $\mathrm{Eu}=63$.)

(a) ${\left({\mathrm{NH}}_4\right)}_2\left[\mathrm{Ce}{\left({\mathrm{NO}}_3\right)}_6\right]$

(b) $\mathrm{Gd}{\left({\mathrm{NO}}_3\right)}_3$ and

(c) $\mathrm{Eu}{\left({\mathrm{NO}}_3\right)}_3$

JEE Main 2021 (16 Mar Shift 2)

Options

• A: $\left(\mathrm{b}\right)<\left(\mathrm{a}\right)<\left(\mathrm{c}\right)$
• B: $\left(\mathrm{c}\right)<\left(\mathrm{a}\right)<\left(\mathrm{b}\right)$
• C: $\left(\mathrm{a}\right)<\left(\mathrm{b}\right)<\left(\mathrm{c}\right)$
• D: $\left(\mathrm{a}\right)<\left(\mathrm{c}\right)<\left(\mathrm{b}\right)$

Question

Match List-I with List-II :

Choose the correct answer from the options given below:

JEE Main 2021 (17 Mar Shift 2)

Options

• A: $\left(\mathrm{a}\right)-\left(\mathrm{iii}\right), \left(\mathrm{b}\right)-\left(\mathrm{i}\right), \left(\mathrm{c}\right)-\left(\mathrm{ii}\right), \left(\mathrm{d}\right)-\left(\mathrm{iv}\right)$
• B: $(\mathrm{a})-(\mathrm{iv}) ,(\mathrm{b})-(\mathrm{ii}),(\mathrm{c})-(\mathrm{iii}),(\mathrm{d})-(\mathrm{i})$
• C: $(\mathrm{a})-(\mathrm{ii}),\; (\mathrm{b})-(\mathrm{i}),\; (\mathrm{c})-(\mathrm{iii}),\; (\mathrm{d})-(\mathrm{iv})$
• D: $\left(\mathrm{a}\right)-\left(\mathrm{i}\right),\left(\mathrm{b}\right)-\left(\mathrm{ii}\right),\left(\mathrm{c}\right)-\left(\mathrm{iii}\right),\left(\mathrm{d}\right)-\left(\mathrm{iv}\right)$

Question

Spin only magnetic moment of an octahedral complex of ${\mathrm{Fe}}^{2+}$ in the presence of a strong field ligand in BM is:

JEE Main 2021 (20 Jul Shift 2)

Options

• A: $4.89$
• B: $2.82$
• C: $0$
• D: $3.46$

Question

The calculated magnetic moments (spin only value) for species ${\left[{\mathrm{FeCl}}_4\right]}^{2-},{\left[\mathrm{Co}{\left({\mathrm{C}}_2{\mathrm{O}}_4\right)}_3\right]}^{3-}$ and ${\mathrm{MnO}}_4^{2-}$ respectively are:

JEE Main 2021 (24 Feb Shift 2)

Options

• A: $4.90, 0$ and $1.73 \mathrm{BM}$
• B: $4.90, 0$ and $2.83 \mathrm{BM}$
• C: $5.82, 0$ and $0 \mathrm{BM}$
• D: $5.92, 4.90$ and $0 \mathrm{BM}$

Question

Which one of the following metal complexes is most stable?

JEE Main 2021 (25 Jul Shift 2)

Options

• A: $\left[\mathrm{Co}\left(\mathrm{en}\right){\left({\mathrm{NH}}_3\right)}_4\right]{\mathrm{Cl}}_2$
• B: $\left[\mathrm{Co}(\mathrm{en}{)}_3\right]{\mathrm{Cl}}_2$
• C: $\left[\mathrm{Co}(\mathrm{en}{)}_2{\left({\mathrm{NH}}_3\right)}_2\right]{\mathrm{Cl}}_2$
• D: $\left[\mathrm{Co}{\left({\mathrm{NH}}_3\right)}_6\right]{\mathrm{Cl}}_2$

Question

Arrange the following Cobalt complexes in the order of increasing Crystal Field Stabilization Energy (CFSE) value.

Complexes: $\begin{array}{cccc}\underset{\mathrm{A}}{{\left[{\mathrm{CoF}}_6\right]}^{3-}},& \underset{\mathrm{B}}{{\left[\mathrm{Co}{\left({\mathrm{H}}_2\mathrm{O}\right)}_6\right]}^{2+}},& \underset{\mathrm{C}}{{\left[\mathrm{Co}{\left({\mathrm{NH}}_3\right)}_6\right]}^{3+}}\text{ and }\underset{\mathrm{D}}{{\left[\mathrm{Co}(\mathrm{en}{)}_3\right]}^{3+}}& \end{array}$

Choose the correct option :

JEE Main 2021 (26 Aug Shift 2)

Options

• A: $\mathrm{B}<\mathrm{C}<\mathrm{D}<\mathrm{A}$
• B: $\mathrm{B}<\mathrm{A}<\mathrm{C}<\mathrm{D}$
• C: $\mathrm{A}<\mathrm{B}<\mathrm{C}<\mathrm{D}$
• D: $\mathrm{C}<\mathrm{D}<\mathrm{B}<\mathrm{A}$

Question

The additon of dilute $\mathrm{NaOH}$ to ${\mathrm{Cr}}^{3+}$ salt solution will give :

JEE Main 2021 (27 Aug Shift 2)

Options

• A: a solution of ${\left[\mathrm{Cr}(\mathrm{OH}{)}_4\right]}^{-}$
• B:

  precipitate of ${\left[\mathrm{Cr}(\mathrm{OH}{)}_6\right]}^{3-}$

• C: precipitate of ${\mathrm{Cr}}_2{\mathrm{O}}_3{\left({\mathrm{H}}_2\mathrm{O}\right)}_{\mathrm{n}}$
• D: precipitate of $\mathrm{Cr}(\mathrm{OH}{)}_3$

Question

White precipitate of $\mathrm{AgCl}$ dissolves in aqueous ammonia solution due to formation of

JEE Main 2022 (25 Jun Shift 1)

Options

• A: $\left[\mathrm{Ag}{\left({\mathrm{NH}}_3\right)}_4\right]{\mathrm{Cl}}_2$
• B: $\left[\mathrm{Ag}{\left(\mathrm{Cl}\right)}_2{\left({\mathrm{NH}}_3\right)}_2\right]$
• C: $\left[\mathrm{Ag}{\left({\mathrm{NH}}_3\right)}_2\right]\mathrm{Cl}$
• D: $\left[\mathrm{Ag}\left({\mathrm{NH}}_3\right)\mathrm{Cl}\right]\mathrm{Cl}$

Question

The metal complex that is diamagnetic is (Atomic number : $\mathrm{Fe},26;\mathrm{Cu},29$)

JEE Main 2022 (26 Jul Shift 2)

Options

• A: ${\mathrm{K}}_3\left[\mathrm{Cu}{\left(\mathrm{CN}\right)}_4\right]$
• B: ${\mathrm{K}}_2\left[\mathrm{Cu}{\left(\mathrm{CN}\right)}_4\right]$
• C: ${\mathrm{K}}_3\left[\mathrm{Fe}{\left(\mathrm{CN}\right)}_4\right]$
• D: ${\mathrm{K}}_4\left[{\mathrm{FeCl}}_6\right]$

Question

${\mathrm{Fe}}^{3+}$ cation gives a prussian blue precipitate on addition of potassium ferrocyanide solution due to the formation of

JEE Main 2022 (27 Jul Shift 2)

Options

• A: ${\left[\mathrm{Fe}{\left({\mathrm{H}}_2\mathrm{O}\right)}_6\right]}_2\left[\mathrm{Fe}{\left(\mathrm{CN}\right)}_6\right]$
• B: ${\mathrm{Fe}}_2{\left[\mathrm{Fe}{\left(\mathrm{CN}\right)}_6\right]}_2$
• C: ${\mathrm{Fe}}_3{\left[\mathrm{Fe}{\left(\mathrm{OH}\right)}_2{\left(\mathrm{CN}\right)}_4\right]}_2$
• D: ${\mathrm{Fe}}_4{\left[\mathrm{Fe}{\left(\mathrm{CN}\right)}_6\right]}_3$

Question

Which of the following will have maximum stabilization due to crystal field?

JEE Main 2022 (27 Jun Shift 1)

Options

• A: ${\left[\mathrm{Ti}{\left({\mathrm{H}}_2\mathrm{O}\right)}_6\right]}^{3+}$
• B: ${\left[\mathrm{Co}{\left({\mathrm{H}}_2\mathrm{O}\right)}_6\right]}^{2+}$
• C: ${\left[\mathrm{Co}{\left(\mathrm{CN}\right)}_6\right]}^{3-}$
• D: ${\left[\mathrm{Cu}{\left({\mathrm{NH}}_3\right)}_4\right]}^{2+}$

Question

Match List-I with List-II

Choose the correct answer from the options given below

JEE Main 2022 (28 Jul Shift 2)

Options

• A: $\mathrm{A}-\mathrm{IV},\mathrm{B}-\mathrm{I},\mathrm{C}-\mathrm{III},\mathrm{D}-\mathrm{II}$
• B: $\mathrm{A}-\mathrm{I},\mathrm{B}-\mathrm{IV},\mathrm{C}-\mathrm{III},\mathrm{D}-\mathrm{II}$
• C: $\mathrm{A}-\mathrm{I},\mathrm{B}-\mathrm{IV},\mathrm{C}-\mathrm{II},\mathrm{D}-\mathrm{III}$
• D: $\mathrm{A}-\mathrm{IV},\mathrm{B}-\mathrm{I},\mathrm{C}-\mathrm{II},\mathrm{D}-\mathrm{III}$

Question

In the cobalt-carbonyl complex : $\left[{\mathrm{Co}}_2{\left(\mathrm{CO}\right)}_8\right]$, number of $\mathrm{Co}-\mathrm{Co}$ bonds is "$\mathrm{X}$" and terminal $\mathrm{CO}$ ligands is " $\mathrm{Y}$". $\mathrm{X}+\mathrm{Y}=$___

JEE Main 2022 (24 Jun Shift 1)

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Question

Consider the following metal complexes :

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

${\left[\mathrm{CoCl}{\left({\mathrm{NH}}_3\right)}_5\right]}^{2+}$

${\left[\mathrm{Co}(\mathrm{CN}{)}_6\right]}^{3-}$

${\left[\mathrm{Co}{\left({\mathrm{NH}}_3\right)}_5\left({\mathrm{H}}_2\mathrm{O}\right)\right]}^{3+}$

The spin-only magnetic moment value of the complex that absorbs light with shortest wavelength is B.M. (Nearest integer)

JEE Main 2022 (25 Jul Shift 1)

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Question

The spin-only magnetic moment value of ${\mathrm{M}}^{3+}$ ion (in gaseous state) from the pairs ${\mathrm{Cr}}^{3+}/{\mathrm{Cr}}^{2+},{\mathrm{Mn}}^{3+}/{\mathrm{Mn}}^2,{\mathrm{Fe}}^{3+}/{\mathrm{Fe}}^{2+}$ and ${\mathrm{Co}}^{3+}/{\mathrm{Co}}^{2+}$ that has negative standard electrode potential, is_____ $\mathrm{B}.\mathrm{M}.$

JEE Main 2022 (25 Jul Shift 2)

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Question

If ${\left[\mathrm{Cu}{\left({\mathrm{H}}_2\mathrm{O}\right)}_4\right]}^{2+}$ absorbs a light of wavelength $600 \mathrm{nm}$ for $\mathrm{d}-\mathrm{d}$ transition, then the value of octahedral crystal field splitting energy for ${\left[\mathrm{Cu}{\left({\mathrm{H}}_2\mathrm{O}\right)}_6\right]}^{2+}$ will be____$\times {10}^{-21} \mathrm{J}$ [Nearest integer]

(Given : $\mathrm{h}=6.63\times {10}^{-34}\mathrm{Js}$ and $\mathrm{c}=3.08\times {10}^8{ \mathrm{ms}}^{-1}$)

JEE Main 2022 (25 Jun Shift 1)

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Question

Match List I with List II

Choose the correct answer from the options given below :-

JEE Main 2023 (25 Jan Shift 2)

Options

• A: $\mathrm{A}-\mathrm{IV}, \mathrm{B}-\mathrm{I}, \mathrm{C}-\mathrm{III}, \mathrm{D}-\mathrm{II}$
• B: $\mathrm{A}-\mathrm{III}, \mathrm{B}-\mathrm{II}, \mathrm{C}-\mathrm{I}, \mathrm{D}-\mathrm{IV}$
• C: $\mathrm{A}-\mathrm{III}, \mathrm{B}-\mathrm{I}, \mathrm{C}-\mathrm{II}, \mathrm{D}-\mathrm{IV}$
• D: $\mathrm{A}- \mathrm{II}, \mathrm{B}-\mathrm{III}, \mathrm{C}-\mathrm{IV}, \mathrm{D}-\mathrm{I}$