The 'brown ring' formed at the junction of two layers in the test of nitrate is due to the formation of a complex ion, ${\left[\mathrm{Fe}{\left({\mathrm{H}}_{2}\mathrm{O}\right)}_{5}\mathrm{NO}\right]}^{2+}.$ Which of the following statemens are correct for this complex [u=3.87 B.M.)

(i) Oxidation state of Fe is +1 and NO exists as ${\mathrm{NO}}^{+}.$

(ii) The complex ion is in octahedral geometry as attained by ${\mathrm{sp}}^{3}{\mathrm{d}}^{2}$ hybridisation.

(iii) The complex is paramagnetic and has three unpaired electrons due to transfer of electron from NO to ${\mathrm{Fe}}^{2+}.$

(iv) The complex is in octahedral geometry as attained by ${\mathrm{d}}^{2}{\mathrm{sp}}^{3}$ hybridisation.

(v) The brown colour of the complex is attributed to d-d transition of electron.

(A) (i), (ii) and (v)

(B) (iii), (iv) and (v)

(C) (i), (ii) and (iii)

(D) (ii), (iii) and (v)

Concept Questions :-

Coordination comp,Introduction and Classification / Nomenclature
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Which of the following statements is most likely to be incorrect ?

(A) $\mathrm{Ti}{\left({\mathrm{NO}}_{3}\right)}_{4}$ is a colourless compound

(B) ${\left[\mathrm{Cu}{\left({\mathrm{NCCH}}_{3}\right)}_{4}\right]}^{+}{\mathrm{BF}}_{4}^{-}$ is a colourless compound

(C) ${\left[\mathrm{Cr}{\left({\mathrm{NH}}_{3}\right)}_{6}\right]}^{3+}3{\mathrm{Cl}}^{‐}$ is a coloured compound.

(D) ${\mathrm{K}}_{3}\left[{\mathrm{VF}}_{6}\right]$ is a colourless compound

Concept Questions :-

Coordination comp,Introduction and Classification / Nomenclature
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Identify the correct order of wavelength of light absorbed for the following complex ions.

${\left[\mathrm{Co}{\left(\mathrm{en}\right)}_{3}\right]}^{3+}$

I                                      II                                 III                                 IV

(A) III>I>IV>II

(B) II>IV>I>III

(C) III>I>II>IV

(D) I>III>IV>II

Concept Questions :-

VBT & CFT, Limitation /Hybridisation
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The possible geometric isomers shown by ${\left[\mathrm{Co}\left(\mathrm{en}\right){\mathrm{Br}}_{2}{\mathrm{Cl}}_{2}\right]}^{-}$ is :

(A) 2

(B) 3

(C) 4

(D) 6

Concept Questions :-

Isomer in Coordination Compound
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The total number of isomers of the complex, $\left[\mathrm{Co}{\left({\mathrm{NH}}_{3}\right)}_{4}{\left({\mathrm{NO}}_{2}\right)}_{2}\left({\mathrm{NO}}_{3}\right)\right]$ complex is :

(A) 10

(B) 6

(C) 4

(D) 12

Concept Questions :-

Isomer in Coordination Compound
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Which one of the following complexes exhibit chirality ?

(A) ${\left[\mathrm{Cr}{\left(\mathrm{ox}\right)}_{3}\right]}^{3}$

(B) $\mathrm{cis}-\left[{\mathrm{PtCl}}_{2}\left(\mathrm{en}\right)\right]$

(C) $\mathrm{cis}-{\left[{\mathrm{RhCl}}_{2}{\left({\mathrm{NH}}_{3}\right)}_{2}\right]}^{‐}$

(D) $\mathrm{mer}-\left[\mathrm{Co}{\left({\mathrm{NO}}_{2}\right)}_{3}\left(\mathrm{trine}\right)\right]$

Concept Questions :-

Isomer in Coordination Compound
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Which of the following has both fac-mer and optical isomers?

(A) $\left[\mathrm{Co}{\left({\mathrm{NH}}_{3}\right)}_{3}{\left({\mathrm{NO}}_{3}\right)}_{3}\right]$

(B) ${\left[\mathrm{Co}{\left(\mathrm{ox}\right)}_{3}\right]}^{3-}$

(C) $\left[\mathrm{Co}{\left(\mathrm{gly}\right)}_{3}\right]$

(D) none of these

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Assertion : In complex  the 'spin only' magnetic moment is close to 1.73 B.M.

Reason : All known mononuclear complexes of chromium (III), irrespective of the strength of the

ligand field, must have three unpaired electrons.

1. If both the assertion and the reason are true and the reason is a correct explanation of the assertion
2. If both the assertion and reason are true but the reason is not a correct explanation of the assertion
3. If the assertion is true but the reason is false
4. If both the assertion and reason are false
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Assertion : tris (ethane-1, 2-diamine) nickel(II) chloride is homoleptic outer orbital complex

Reason : The geometry of Ni in tris (ethane-1, 2-diamine) nickel(II) chloride is trigonal bipyramidal.

1. If both the assertion and the reason are true and the reason is a correct explanation of the assertion
2. If both the assertion and reason are true but the reason is not a correct explanation of the assertion
3. If the assertion is true but the reason is false
4. If both the assertion and reason are false

Concept Questions :-

VBT & CFT, Limitation /Hybridisation
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Assertion : Bis(dimethylglyoximato)nickel(II) can show geometrical isomerism.

Reason : Tetrahedral complexes with chiral structure exhibit optical isomerism.

1. If both the assertion and the reason are true and the reason is a correct explanation of the assertion
2. If both the assertion and reason are true but the reason is not a correct explanation of the assertion
3. If the assertion is true but the reason is false
4. If both the assertion and reason are false

Concept Questions :-

Ligands
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Difficulty Level: