Coordination compounds are molecules that contain one or more metal centres that are linked to ligands. These complexes can be charged or neutral. When the complex is charged, neighbouring counter-ions stabilise it. Ligands are thought to be attached to the central ion by coordinate (dative covalent) bonds, but the bonding is actually more complicated in some cases.
Download Class 12 Chemistry Worksheet on Chapter 9 Coordination Compounds Set 4 PDF.
CBSE Class 12 Chemistry Chapter 9 Coordination Compounds Worksheet – Set 4
Q-1: What type of magnetism does a substance exhibit when its domains are arranged in equal numbers and opposite directions?
Q-2: When pyrolusite ore MnO2 is fused with KOH in the presence of air, a green compound (A) is formed, which then undergoes a disproportionation reaction in acidic medium to yield a purple compound (B).
i) Write down the ionic forms for the compounds (A) and (B).
(ii) How does compound (B) react when heated?
Q-3: The coordination compound NiCl2.4NH3 on mixing with AgNO3, precipitates 2 moles of AgCl per mole of the compound. Write:
(i) The complex’s structural formula
(ii) the complex’s IUPAC name
Q-4: i) Write the magnetic character,hybridisation type, geometry, and spin of the complex [CoF6]3-. (At. no. : Co = 27) Illustrate with the help of a diagram.
(ii) Draw one of the optically active geometrical isomers of the complex [Co(en)2 Cl2 ]+.
Q-5: Account for the following
- Cupric chloride is coloured and paramagnetic, whereas cuprous chloride is diamagnetic and colourless.
- Use Hund’s rule to find Ce+3 ions’ electronic configuration and calculate its magnetic moment.
- Scandium salts are all white.
Q-6:The magnetic moment of an octahedral metal ion M2+ is 4.0 BM. The correct metal ion and d-electron configuration is provided by
- Co2+, t2g5eg2
- Mn2+, t2g3eg1
- Cr2+, t2g4eg2
- Fe2+, t2g4eg2
Q-7: For the complex ion, [Cu(NH3)6]2+, the coordination geometry will be
- Octahedral
- Trigonal prismatic
- Trigonal antiprismatic
- Tetrahedral
Q-8: According to crystal field theory, Ni2+ can have two unpaired electrons in
- Square planar geometry only
- Tetrahedral geometry only
- Octahedral geometry only
- Both octahedral and tetrahedral geometry only
Q-9: Potassium dichromate’s colour is caused by
- d-d transition
- Charge transfer
- LMCT
- MLCT
Q-10: The octahedral crystal field splitting (Δo) of d-orbital energies of the following metal ions decreases in the order
- Co2+>Co3+>Rh3+
- Rh3+>Co3+>Co2+
- Rh3+>Co2+>Co3+
- Co3+>Co2+>Rh3+
Q-11: M is a transition metal of the first row. When MCl2 is treated with aqueous ammonia, it produces a blue complex N solution. A solution of MCl2 produces a bright red complex O precipitate with ethanolic dimethylglyoxime.
i) Determine M and sketch the structure of O.
ii) Determine M’s hybridisation in complex N.
iii) Determine the paramagnetic complex.
Q-12: The number of ions produced by the complete dissociation of one mole of potash alum in water is
- 3
- 4
- 5
- 6
Q-13: Ion(s) having zero magnetic moment(spin only) is/are
- Sc3+
- Ti3+
- Cu2+
- Zn2+
Q-14: How does EDTA help as a cure for lead poisoning?
Q-15: Explain the distinctions between primary and secondary valency.
Q-16: Why is it that tetrahedral complexes always have a high spin?
Q-17:Which of the following compounds is expected to be coloured?
- Ag2SO4
- CuF2
- MgF2
- CuCl
Q-18: The pair of the compounds in which both the metals are in highest possible oxidation state is
a) [Fe(CN)6]3-, [Co(CN)6]3-
b) CrO2Cl2, MnO4–
c) TiO3, MnO2
d) [Co(CN)6]3-, MnO2
Q-19: Write the formulas for the following coordination compounds:
(i) Tetraamminedichloridocobalt(III) chloride
(ii) Potassium tetracyanonickelate(II)
(iii) Tris(ethane–1,2–diamine) chromium(III) chloride
(iv) Pentaamminenitrito-O-cobalt(III)
(v) Potassium tetrachloridopalladate(II)
Q-20: A group of students was smoking cigarettes on college grounds. A social activist noticed them and advised them not to smoke.
(a) Which social activity value do you want to instil in the youth by forbidding them from smoking?
(b) As a chemistry student, write the name of the alloy used in lighters flint.
(c) Discuss smoking-related diseases.
(d) Identify the habit-forming chemical found in cigarette smoke.
Download the PDF to access answers to the Chemistry Worksheet for Class 12 Chemistry Chapter 9 Coordination Compounds Set – 4.
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