Textbooks

NCERT Chemistry Part-I Std 12

Coordination Compounds

Chapter 9 : Coordination Compounds

Q. Explain the bonding in coordination compounds in terms of Werners postulates.

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Q. How many geometrical isomers are possible in the following coordination entities?
(i)

[C r (C_{2} O_{4})_{3}]^{3 -}

(ii)

[C o (N H_{3})_{3} C l_{3}]

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Q. What is the coordination entity formed when excess of aqueous

K C N

is added to an aqueous solution of copper sulphate? Why is it that no precipitate of copper sulphide is obtained when

H_{2} S (g)

is passed through this solution?

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Q. What is crystal field splitting energy? How does the magnitude of

Δ_{0}

decide the actual configuration of d orbitals in a coordination entity?

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Q. Specify the oxidation numbers of the metals in the following coordination entities:
(i)

[C o (H_{2} O) (C N) (e n)_{2}]^{2 +}

(ii)

[C o B r_{2} (e n)_{2}]^{+}

(iii)

[P t C l_{4}]^{2 -}

(iv)

K_{3} [F e (C N)_{6}]

(v)

[C r (N H_{3})_{3} C l_{3}]

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Q. Draw the structures of optical isomers of:
(i)

[C r (C_{2} O_{4})_{3}]^{3 -}

(ii)

[P t C l_{2} (e n)_{2}]^{2 +}

(iii)

[C r (N H_{3})_{2} C l_{2} (e n)]^{+}

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Q. Using IUPAC norms write the formulas for the following:

(i) Tetrahydroxidozincate(II)
(ii) Potassium tetrachloridopalladate(II)

(iii) Diamminedichloridoplatinum(II)

(iv) Potassium tetracyanidonickelate(II)
(v) Pentaamminenitrito-O-cobalt(III)
(vi) Hexaamminecobalt(III) sulphate
(vii) Potassium tri(oxalato)chromate(III)
(viii) Hexaammineplatinum(IV)
(ix) Tetrabromidocuprate(II)
(x) Pentaamminenitrito-N-cobalt(III)

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[C r (N H_{3})_{6}]^{3 +}

is paramagnetic while

[N i (C N)_{4}]^{2 -}

is diamagnetic. Explain why?

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Q. Draw all the isomers (geometrical and optical) of:
(i)

[C o C l_{2} (e n)_{2}]^{+}

(ii)

[C o (N H_{3}) C l (e n)_{2}]^{2 +}

(iii)

[C o (N H_{3})_{2} C l_{2} (e n)]^{+}

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Q. A solution of

[N i (H_{2} O)_{6}]^{2 +}

is green but a solution of

[N i (C N)_{4}]^{2 -}

is colourless, Explain.

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Q. What is meant by unidentate, didentate and ambidentate ligands? Give two examples for each.

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Q. Draw figure to show the splitting of d orbitals in an octahedral crystal field.

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Q. What is spectrochemical series? Explain the difference between a weak field ligand and a strong field ligand

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Q. Write all the geometrical isomers of

[P t (N H_{3}) (B r) (C l) (p y)]

and how many of these will exhibit optical isomers?

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Q. Using IUPAC norms write the systematic names of the following:
(i)

[C o (N H_{3})_{6}] C l_{3}

(ii)

[P t (N H_{3})_{2} C l (N H_{2} C H_{3})] C l

(iii)

[T i (H_{2} O)_{6}]^{3 +}

(iv)

[C o (N H_{3})_{4} C l (N O_{2}] C l

(v)

[M n (H_{2} O)_{6}]^{2 +}

(vi)

[N i C l_{4}]^{2 -}

(vii)

[N i (N H_{3})_{6}] C l_{2}

(viii)

[C o (e n)_{3}]^{3 +}

(ix)

[N i (C O)_{4}]

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Q. Aqueous copper sulphate solution (blue in colour) gives:
(i) a green precipitate with aqueous potassium fluoride and
(ii) a bright green solution with aqueous potassium chloride. Explain these experimental results.

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Q. List various types of isomerism possible for coordination compounds, giving an example of each.

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Q. Explain with two examples each of the following: coordination entity, ligand, coordination number, coordination polyhedron, homoleptic and heteroleptic

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Q. Discuss the nature of bonding in the following coordination entities on the basis of valence bond theory:
(i)

[F e (C N)_{6}]^{4 -}

(ii)

[F e F_{6}]^{3 -}

(iii)

[C o (C_{2} O_{4})_{3}]^{3 -}

(iv)

[C o F_{6}]^{3 -}

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F e S O_{4}

solution mixed with

(N H_{4})_{2} S O_{4}

solution in

1 : 1

molar ratio gives the test of

F e^{2 +}

ion but

C u S O_{4}

solution mixed with aqueous ammonia in

1 : 4

molar ratio does not give the test of

C u^{2 +}

ion. Explain why?

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