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JEE • CHEMISTRY • CO-ORDINATION COMPOUNDS

Co-ordination compounds practice · Hard

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31 Hard

31 of 37

Analyzing +4 | -1

The total number of possible isomers for the complex compound

\left[ {\mathrm{Cu}{{\left( {\mathrm{N}{\mathrm{H}_3}} \right)}_4}} \right]\left[ {\mathrm{PtC}{\mathrm{l}_4}} \right]

View answer and explanation

Correct option: A

The correct answer is A (6) because the complex compound [Cu(NH3)4][PtCl4] can form six different isomers through ligand exchange between the two coordination complexes.

32 Hard

32 of 37

Understanding +4 | -1

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

reacts with

{FeCl}_3

to form:

View answer and explanation

Correct option: B

{KFe}\left[{Fe}({CN})_6\right]

Option B (

{KFe}{Fe}({CN})_6

) is correct because

{K}_4{Fe}({CN})_6

reacts with

{FeCl}_3

to form Prussian blue, which then reacts with more

{K}_4{Fe}({CN})_6

to form

{KFe}{Fe}({CN})_6

33 Hard

33 of 37

Application +4 | -1

A metal complex having composition

\mathrm{Cr}\left(\mathrm{NH}_3\right)_4 \mathrm{Cl}_2 \mathrm{Br}

has been isolated in two forms

\mathrm{A}

and

B . A

reacts with

\mathrm{AgNO}_3

producing a white precipitate which was soluble in dilute ammonia solution.

B

reacts with

\mathrm{AgNO}_3

producing a pale yellow precipitate soluble in concentrated ammonia solution. The formulae of

A

and

B

are respectively

View answer and explanation

Correct option: D

\left[\mathrm{Cr}\left(\mathrm{NH}_3\right)_4 \mathrm{BrCl}\right] \mathrm{Cl} ;\left[\mathrm{Cr}\left(\mathrm{NH}_3\right)_4 \mathrm{Cl}_2\right] \mathrm{Br}

The correct answer is D ([Cr(NH_3)_4BrCl]Cl ; [Cr(NH_3)_4Cl_2]Br) because it correctly identifies which ions are outside the coordination sphere based on their reaction with AgNO_3.

34 Hard

34 of 37

Analyzing +4 | -1

Each of the compounds

{Pt}\left({NH}_3\right)_6 {Cl}_4 \cdot {Cr}\left({NH}_3\right)_6 {Cl}_3, {Co}\left({NH}_3\right)_4 {Cl}_3

and

{K}_2 {Pt} . {Cl}_6

were dissolved in water to make its

0.001 \mathrm{~M}

solution. The correct order of their increasing conductivity in solution is

View answer and explanation

Correct option: C

Co(NH_3)_4 Cl_3 < K_2Pt.Cl_6 < Cr(NH_3)_6 Cl_3 < Pt(NH_3)_6 Cl_4

Option C is correct because the conductivity increases with the number of ions produced in solution, and the order reflects the increasing number of ions.

35 Hard

35 of 37

Analyzing +4 | -1

Assertion : In a mixture of

{\text{Cd(II)}}

and

{\text{Cu(II)}}

{\text{(C}}{{\text{d}}^{ + 2}}{\text{)}}

gets precipitated in presence of

\mathrm{KCN}

by H2S.

Reason : The stability constant of

{\left[ {{\text{(Cu(CN}}{{\text{)}}_{\text{4}}}} \right]^{ - 3}}

is greater than

{\left[ {{\text{(Cu(CN}}{{\text{)}}_{\text{4}}}} \right]^{ - 2}}

View answer and explanation

Correct option: A

If both Assertion & Reason are True & the Reason is a correct explanation of the Assertion.

Option A (If both Assertion & Reason are True & the Reason is a correct explanation of the Assertion) is correct because the formation of a stable complex with Cu(II) allows Cd(II) to precipitate as CdS.

36 Hard

36 of 37

Analyzing +4 | -1

Complex

X

of composition

Cr{\left( {{H_2}O} \right)_6}C{l_n}

has a spin only magnetic moment of 3.83 BM. It reacts with

AgN{O_3}

and shows geometrical isomerism. The IUPAC nomenclature of

X

View answer and explanation

Correct option: D

tetraaquadichlorido - chromium (III) chloride dihydrate

Option D is correct because the complex has a Cr³⁺ ion with 3 unpaired electrons, reacts with AgNO₃ indicating a Cl⁻ ion outside the coordination sphere, and exhibits geometrical isomerism, leading to the formula [Cr(H₂O)₄Cl₂]Cl·2H₂O.

37 Hard

37 of 37

Understanding +4 | -1

Which of the following complexes are heteroleptic ?

View answer and explanation

Correct option: B

\left[\mathrm{Fe}\left(\mathrm{NH}_3\right)_4 \mathrm{Cl}_2\right]^{+}

Option B (

\mathrm{Fe}(\mathrm{NH}_3)_4 \mathrm{Cl}_2^{+}

) is correct because heteroleptic complexes contain more than one type of ligand.

Revision notes and key takeaways

Review CO-ORDINATION COMPOUNDS in your textbook or class notes, then use this set to check your understanding.

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