Coordination Compounds

Question

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.

Solution

Aqueous copper sulphate contains coordination entities [Cu(H₂O)₄]²⁺ which are blue in colour. Water molecule is a weaker ligand than Cl^– and F^–.
(a) On addition of aqueous KF solution, a new complex entity is formed which is of green colour.

${[Cu (H_{2} O)_{4}]}^{2} + \underset{(f r o m K F a q . s o l u t i o n)}{4 F^{-}} \to {[C u F_{4}]}^{2 +} + 4 H_{2} O$

(b) On addition of aqueous solution of KCl, an another complex entity is formed which is soluble in water.

${[Cu (H_{2} O)_{4}]}^{2 +} + \underset{(from KCl aq . solution)}{4 {Cl}^{-}} \to \underset{b r i g h t g r e e n s o l u t i o n (a s o l u b l e c o m p l e x e n t i t y)}{{[C u c l_{4}]}^{2 -}} + 4 H_{2} O$

Some More Questions From Coordination Compounds Chapter

Write the IUPAC names of the following coordination compounds:
(i) [Co(NH₃)₆]Cl₃(ii) [Co(NH₃)₅Cl]Cl₂
(iii) K₃[Fe(CN)₆]
(iv) K₃[Fe(C₂O₄)_3]
(v) K₂[PdCl4]
(vi) [Pt(NH₃)₂Cl(NH₂CH₃)]Cl.

Indicate the type of isomerism exhibited by the following complexes and draw structures for these isomers:
(i) K[Cr(H₂O)₂(C₂O₄)₂], (ii) [Co(en)₃Cl₃,
(iii) [Co(NH₃)₅(NO₂)]|NO₃]₂, (iv) [Pt(NH₃)(H₂O)Cl₂]

Explain on the basis of valence bond theory that [Ni(CN)₄]^2– ion with square planar is diamagnetic and the [NiCl₄]^2– ion with tetrahedral geometry is paramagnetic.

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Coordination Compounds

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.

Some More Questions From Coordination Compounds Chapter

Write the formula for the following coordination compound:
Tetraaminediaquacobalt(lll)chloride

Write the formula for the following coordination compound:
Potassium tetracyanidonickelate(II)

Write the formula for the following coordination compound:
Tris(ethane -1, 2-diamine) chromium(III) chloride

Write the formula for the following coordination compound:
Amminebromidochloridonitrito-N-platinate (II)

Write the formula for the following coordination compound:
Dichloridobis(ethane-1, 2-diamine)platinum(lV) nitrate.

Write the formula for the following coordination compound:
Iron(III) hexacyanidoferrate(II)

Write the IUPAC names of the following coordination compounds:
(i) [Co(NH₃)₆]Cl₃(ii) [Co(NH₃)₅Cl]Cl₂
(iii) K₃[Fe(CN)₆]
(iv) K₃[Fe(C₂O₄)_3]
(v) K₂[PdCl4]
(vi) [Pt(NH₃)₂Cl(NH₂CH₃)]Cl.

Indicate the type of isomerism exhibited by the following complexes and draw structures for these isomers:
(i) K[Cr(H₂O)₂(C₂O₄)₂], (ii) [Co(en)₃Cl₃,
(iii) [Co(NH₃)₅(NO₂)]|NO₃]₂, (iv) [Pt(NH₃)(H₂O)Cl₂]

Explain on the basis of valence bond theory that [Ni(CN)₄]^2– ion with square planar is diamagnetic and the [NiCl₄]^2– ion with tetrahedral geometry is paramagnetic.

Mock Test Series

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Coordination Compounds

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.

Some More Questions From Coordination Compounds Chapter

Write the formula for the following coordination compound:Tetraaminediaquacobalt(lll)chloride

Write the formula for the following coordination compound:Potassium tetracyanidonickelate(II)

Write the formula for the following coordination compound:Tris(ethane -1, 2-diamine) chromium(III) chloride

Write the formula for the following coordination compound:Amminebromidochloridonitrito-N-platinate (II)

Write the formula for the following coordination compound:Dichloridobis(ethane-1, 2-diamine)platinum(lV) nitrate.

Write the formula for the following coordination compound:Iron(III) hexacyanidoferrate(II)

Write the IUPAC names of the following coordination compounds:(i) [Co(NH3)6]Cl3(ii) [Co(NH3)5Cl]Cl2(iii) K3[Fe(CN)6](iv) K3[Fe(C2O4)3](v) K2[PdCl4] (vi) [Pt(NH3)2Cl(NH2CH3)]Cl.

Indicate the type of isomerism exhibited by the following complexes and draw structures for these isomers:(i) K[Cr(H2O)2(C2O4)2], (ii) [Co(en)3Cl3, (iii) [Co(NH3)5(NO2)]|NO3]2, (iv) [Pt(NH3)(H2O)Cl2]

Explain on the basis of valence bond theory that [Ni(CN)4]2– ion with square planar is diamagnetic and the [NiCl4]2– ion with tetrahedral geometry is paramagnetic.

Mock Test Series

NCERT Sample Papers

Entrance Exams Preparation

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.

Write the formula for the following coordination compound:
Tetraaminediaquacobalt(lll)chloride

Write the formula for the following coordination compound:
Potassium tetracyanidonickelate(II)

Write the formula for the following coordination compound:
Tris(ethane -1, 2-diamine) chromium(III) chloride

Write the formula for the following coordination compound:
Amminebromidochloridonitrito-N-platinate (II)

Write the formula for the following coordination compound:
Dichloridobis(ethane-1, 2-diamine)platinum(lV) nitrate.

Write the formula for the following coordination compound:
Iron(III) hexacyanidoferrate(II)

Write the IUPAC names of the following coordination compounds:
(i) [Co(NH₃)₆]Cl₃(ii) [Co(NH₃)₅Cl]Cl₂
(iii) K₃[Fe(CN)₆]
(iv) K₃[Fe(C₂O₄)_3]
(v) K₂[PdCl4]
(vi) [Pt(NH₃)₂Cl(NH₂CH₃)]Cl.

Indicate the type of isomerism exhibited by the following complexes and draw structures for these isomers:
(i) K[Cr(H₂O)₂(C₂O₄)₂], (ii) [Co(en)₃Cl₃,
(iii) [Co(NH₃)₅(NO₂)]|NO₃]₂, (iv) [Pt(NH₃)(H₂O)Cl₂]

Explain on the basis of valence bond theory that [Ni(CN)₄]^2– ion with square planar is diamagnetic and the [NiCl₄]^2– ion with tetrahedral geometry is paramagnetic.