CBSE Class 12 Chemistry Coordination Compounds Worksheet Set C

Very Short Answer Questions

Question: When a co-ordination compound CrCl₃⋅6H₂O is mixed with AgNO₃, 2 moles of AgCl are precipitated per mole of the compound. Write IUPAC name of the complex.
Answer: IUPAC name of the complex
[CrCl(H₂O)₅]Cl₂ ·H₂O is :
pentaaquachloridochromium (III) chloride.

Question: Give an example of linkage isomerism.
Answer: [Co(NH₃)₅(NO₂)]Cl₂ and [Co(NH₃)₅(ONO)]Cl₂

Question: Name the following coordination compound :
K₃[CrF₆]
Answer: Potassium hexafluoridochromate (III).

Question: What is a ligand? Give an example of a bidentate ligand.
Answer: The ions or molecules bonded to the central atom in the coordination entity are called ligands. Ethylene diammine is a bidentate ligand.

Question: Write the IUPAC name of
[Cr(NH₃)₆ [Co(CN)₆].
Answer: Hexaamminechromium (III) hexacyanocobaltate (III).

Question: Give an example of coordination isomerism.
Answer: [Co(NH₃)₆][Cr(CN)₆] and [Cr (NH₃)₆] [Co(CN)₆]

Question: Explain the following term giving a suitable example :
Crystal field splitting in an octahedral field.
Answer: The splitting of the degenerate d-orbitals into three orbitals of lower energy, t_2g set and two orbitals of higher energy e_g set due to the interaction of ligand in an octahedral crystal field is known as crystal field splitting in an octahedral field.

Question: Using the IUPAC norms, write the systematic name of the following :
[Co(NH₃)₆] [Cr(CN)₆]
Answer: Hexaamminecobalt (III) hexacyanochromate (III)

Question: Why is CO a stronger ligand than Cl^–?
Answer: Because CO has vacant molecular orbitals with which it can form p-bond with metal through back donation.

Question: Give an example of ionization isomerism.
Answer: [Co(NH₃)₅SO₄]Br and [Co(NH₃)₅ Br] SO₄

Question: Write the IUPAC name of the complex [Cr(NH₃)₄Cl₂]Cl.
Answer: IUPAC name of the complex [Cr(NH₃)4Cl₂]Cl is tetraamminedichloridochromium (III) chloride.

Question: Give IUPAC name of ionisation isomer of [Ni(NH₃)₃NO₃]Cl.
Answer: Ionisation isomer of [(Ni(NH₃)₃NO₃]Cl is [Ni(NH₃)₃Cl]NO₃. The IUPAC name of this complex is triamminechloridonickel (II) nitrate.

Question: Write the IUPAC name of
[PtCl(NH₂CH₃)(NH₃)₂]Cl.
Answer: Diamminechlorido (methylamine) platinum (II) chloride.

Question: Give two examples of coordination compounds used in industries.
Answer: (i) EDTA is used for water sofiening and in purification of metals.
(ii) Wilkinson’s catalyst is used as catalyst for hydrogenation.

Question: Write down the formula of :
Tetraamineaquachloridocobalt (III) chloride.
Answer: [Co(NH₃)₄(H₂O)(Cl)]Cl₂

Question: Give names of two complexes which are used in medicines
Answer: cis-Platin is used in the treatment of cancer.
EDTA is used in lead poisoning.

Question: Write the IUPAC name of [Pt(NH₃)₄Cl₂]Cl₂.
Answer: Tetraamminedichloridoplatinum (IV) chloride

Short Answer Questions

Question: Name the following coordination compounds according to IUPAC system of nomenclature :
(i) [Co(NH₃)₄(H₂O)Cl]Cl₂
(ii) [CrCl₂(en)₂]Cl, (en = ethane – 1,2-diamine)
Answer: (i) Hexaamminecobalt (III) chloride
(ii) Tetrachloridonickelate (II) ion
(iii) Potassiumhexacyanoferrate (III)

Question: Name the following coordination compounds and draw their structures.
(i) [CoCl₂(en)₂]Cl
(ii) [Pt(NH₃)₂Cl(NO₂)]
(At. No. Co = 27, Pt = 78)
Answer: (i) Dichloridobis (ethane-1, 2-diamine)cobalt (III) chloride.

Question: (i) Write down the IUPAC name of the following complex. [Cr (en)₃]Cl₃
(ii) Write the formula for the following complex. Potassium trioxalato chromate (III)
Answer: Tris (ethylenediammine) chromium (III) chloride
(ii) K₃[Cr(ox)₃]

Question: Write the IUPAC name of the following :
(i) [Co(NH₃)₆]Cl₃ (ii) [NiCl₄]^2–
(iii) K₃[Fe(CN)₆]
Answer: (i) Tetraammineaquachloridocobalt(III) chloride
(ii) Dichloridobis(ethane-1,2-diamine)cobalt(III) chloride

Question: Write the name, the structure and the magnetic behaviour of each one of the following complexes :
(i) [Pt(NH₃)Cl(NO₂)] (ii) [Co(NH₃)₄Cl₂]Cl
(iii) Ni(CO)₄
(At. nos. Co = 27, Ni = 28, Pt = 78)
Answer: (i) [Pt(NH₃)₂Cl(NO₂)] :
Diamminechloridonitrito-N-platinum(II)
It is square planar and diamagnetic.
(ii) [Co(NH₃)₄Cl₂]Cl : Tetraamminedichloridocobalt
(III) chloride It is octahedral and diamagnetic.
(iii) Ni(CO)₄ : Tetracarbonylnickel(0)
It is tetrahedral and diamagnetic