COMEDK 2023 Evening Shift | Coordination Compounds Question 9 | Chemistry

A square planar complex of the type Mabcd, where a, b, c and d are unidentate ligands, exhibits geometrical isomerism and exists in one cis-form and two trans-forms.

[$$\mathrm{Co}\left(\mathrm{NH}_3\right)_5 \mathrm{NO}_2$$] Cl₂ exists in 2 forms, the red form and the yellow form which are linkage isomers.

$$\left[\mathrm{Fe}(\mathrm{CN})_6\right]^{3-}$$ is called a Low spin complex.

Out of cis- $$\left[\mathrm{CrCl}_2(\mathrm{ox})_2\right]^{3-}$$ and trans- $$\left[\mathrm{CrCl}_2(\mathrm{ox})_2\right]^{3-}$$, the trans isomer is optically inactive.

COMEDK 2023 Evening Shift

MCQ (Single Correct Answer)

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Which one of the following Coordination entities exhibits Facial and Meridional isomerism?

$$ \left[\mathrm{Co}\left(\mathrm{H}_2 \mathrm{O}\right)_3\left(\mathrm{NO}_2\right)_3\right] $$

$$ \left[\mathrm{Co}(\text { en })_2 \mathrm{Cl}_2\right]^{+} $$

$$ \left[\mathrm{Co}\left(\mathrm{NH}_3\right)_4 \mathrm{Br}_2\right] \mathrm{NO}_3 $$

$$ \left[\mathrm{Co}(\text { en })_3\right] \mathrm{Cl}_3 $$

COMEDK 2022

MCQ (Single Correct Answer)

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The complex which does not show optical isomerism is

cis $$-\left[\mathrm{Co}(\mathrm{en})_2 \mathrm{Cl}_2\right] \mathrm{Cl}$$

cis $$-\left[\mathrm{CrCl}_2(\mathrm{ox})_2\right]^{3-}$$

cis $$-\left[\mathrm{CoCl}(\mathrm{en})_2\left(\mathrm{NH}_3\right)\right]^{2+}$$

cis $$-\left[\mathrm{Co}\left(\mathrm{NH}_3\right)_4 \mathrm{Cl}_2\right]^{+}$$

COMEDK 2022

MCQ (Single Correct Answer)

-0

The oxidation state of nickel in [Ni(CO$$_4$$)] is

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