Chemistry Worksheets Class 12 on Chapter 9 Coordination Compounds with Answers - Set 5

Coordination compounds with a metallic element as the central atom are known as metal complexes. The central atom of these coordination complexes is usually a transition element. It is worth noting that the central atom in these complexes is referred to as the coordination centre. Coordination compounds find many applications in electroplating, textile dyeing and medicinal chemistry.

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Chemistry Worksheets Class 12 on Chapter 9 Coordination Compounds with Answers - Set 5
Chemistry Worksheets Class 12 on Chapter 9 Coordination Compounds with Answers - Set 5
Chemistry Worksheets Class 12 on Chapter 9 Coordination Compounds with Answers - Set 5
Chemistry Worksheets Class 12 on Chapter 9 Coordination Compounds with Answers - Set 5

CBSE Class 12 Chemistry Chapter 9 Coordination Compounds Worksheet – Set 5

Q-1: The correct crystal field strength order is:

  1. SCN–<Cl–<S2-<en
  2. Cl–<SCN–<S2-<en
  3. Cl–<SCN–<en<S2-
  4. SCN–<en<S2-<Cl–

Q-2: K3[Fe(oxalate)3] and K3[Ru(oxalate)3] have spin-only magnetic moments of 5.91 and 1.73 B.M respectively. (Atomic number of Fe and Ru are 26 and 44 respectively)

a) Make a note of their ligand field electron configuration.

b) Find the spin of the complexes

Q-3: Choose the correct IUPAC name(s) of the given compound

IUPAC nomenclature

a) Bis(ethylenediamine)cobalt(III)di-𝛍-hydroxidobis(ethylenediamine)cobalt(III) ion

b) Di-𝛍-hydroxidotetrakis(ethylenediamine)dicobalt(III) ion

c) Di-𝛍-hydroxidobis{bis(ethylenediamine)cobalt(III) } ion

d) Bis{𝛍-hydroxidobis(ethylenediamine)cobalt(III) } ion

Q-4: What is the relationship between the two linear complex ions listed below?

[Cl-Ag-SCN]– [SCN-Ag-Cl] –

  1. Linkage isomers
  2. Coordination isomers
  3. Geometric isomers
  4. Optical isomers

Q-5: In the complex ion [Fe(EDTA)]-., the coordination number and oxidation state of the central metal ion is

  1. C.N. =6 O.N.=+3
  2. C.N.=1, O.N.=-1
  3. C.N.=4, O.N.=+2
  4. C.N.=3, O.N.=+3

Q-6: Out of [Fe(H2O)6]3+, [Fe(SCN)6]3-,[Fe(C2O4)3]3- and [FeCl6]3-..Which complex shows the most stability?

Q-7: The ion EDTA4- stands for ethylenediamine tetraacetate. In [Co(EDTA)]– ion, the total number of N-Co-O bond angles is

Q-8: What is the number of bridging CO groups in octacarbonyl dicobalt(0)? Illustrate with the help of the diagram.

Q-9: Which of the following compounds is not coloured?

a) Na2CuCl4

b) Na2CdCl4

c) K4[Fe(CN)6]

d) K3[Fe(CN)6]

Q-10: Match column I with column II.

Column I Column II
A) Highest density P) Os
B) Colourless salts Q) Cr
C) Maximum magnetic moment R) Zn
D) Variable oxidation state S) Mn

Q-11: Amongst the following, identify the species with a central atom in +6 oxidation state.

  1. MnO4–
  2. [Cr(CN)6.]3-
  3. NiF62-
  4. CrO2Cl2

Q-12: The complex ion which has no d-electrons in the central atom is (at. no Cr=24, Mn=25, Fe=26 and Co=27)

  1. [MnO4]-.
  2. [Co(NH3)6]3+.
  3. [Fe(CN)6]3-
  4. [Cr(H2O)6]3+

Q-13: d-orbital used in back donation of electron from M→L in [Fe(CN)6]3- is

  1. dxy, dyz, dzx
  2. d(x2-y2)
  3. d(z2)
  4. Can’t be predicted

Q-14: The Δo value of [Ni(H2O)6]2+ is 8500 cm-1. The Δo values for [NiCl6]4- and [Ni(NH3)6]2+ compared to [Ni(H2O)6]2+ are

  1. Higher and lower, respectively
  2. Lower and higher, respectively
  3. Higher in both complex ions
  4. Lower in both complex ions

Q-15: Among the following compounds, a normal spinel is

  1. MgFe2O4
  2. ZnFe2O4
  3. CoFe2O4
  4. CuFe2O4

Q-16: The rate of the following redox reaction is slowest when X is

[CoIII(NH3)5X]3+/2+ + [CrII(H2O)6]2+ → [CoII(NH3)5(H2O)]2+ + [CrIII(H2O)5X]3+/2+

  1. H2O
  2. NH3
  3. Cl–
  4. N3–

Q-17: One chromium ion, three bromides, and six water molecules make up a complex. With the addition of excess AgNO3, 1.0 g of the complex’s aqueous solution yielded 0.94 g of AgBr. Determine the complex’s molecular formula.

( Atomic weight: Cr= 52, Br=80, Ag=108, O=16, and H=1)

Q-18: Which metal chelate can be used for separation and quantitative analysis of aluminium ions by gas chromatography?

Q-19: How many isomers are possible for the square planar mononuclear complex [ NH3)2M(CN)2]?

Q-20: Due to a lack of water, the residents of a colony decided to refuse their well, which had not been used for six months. The secretary of the RWA decided to clean the well by putting a small amount of potassium permanganate in it and then loading the well water with alum crystals.

(a) Why did the RWA secretary add potassium permanganate to the well?

(b) Sketch the structure of the permanganate ion, MnO4–.

(c) Why did the RWA secretary add alum to the well?

(d) What are the values related to the use of KMnO4 and alum?

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