Coordination Compounds: Class 12 Previous Year Questions

Coordination Compounds questions asked in CBSE board exams

Repeated questions first. Open the free app to see each question as it appeared in the paper, with its marking scheme.

1. The Valence Bond Theory (VBT) explains the formation, magnetic behaviour and geometry of coordination compounds. The Crystal Field Theory (CFT) of coordination compounds is based on the effect of different crystal fields (provided by the ligands taken as point…
   Board 20264 marksshort answerRepeated: 2024,2026
2. The Valence Bond Theory (VBT) explains the formation, magnetic behaviour and geometrical shapes of coordination compounds whereas for coordination compounds is based on the effect of different crystal fields (provided by ligands taken as point charges), on the…
   Board 20244 marksshort answerRepeated: 2024,2026
3. The correct IUPAC name of the complex [Pt(NH3)2Cl2] is : 1 (A) diamminedichloridoplatinum (IV) (B) diamminedichloridoplatinum (II) (C) dichloridodiammineplatinum (IV) (D) dichloridodiammineplatinum (II) { } 6 6.        ? 1 (…
   Board 20261 markMCQ
4. (a) Write IUPAC names of the following coordination compounds : 2  1 (i) [Ag(NH3)2] [Ag(CN)2] (ii) K3[Fe(C2O4)3] OR (b) (i) Give a chemical test to show that [Co(NH3)5SO4]Cl and [Co(NH3)5Cl]SO4 are ionisation isomers. 2  1 (ii) What is meant by the ‘Chelate …
   Board 20262 marksshort answer
5. (a) Define coordination number. 1 + 1 (b) Indicate the type of isomerism exhibited by the following complex : [Co(en)3]Cl3 { } 12 21. (a)       : 1 + 1 4––3––2– (b)         …
   Board 20262 marksshort answer
6. (a) [Co(NH3)6]3+ is diamagnetic whereas [CoF6]3– is paramagnetic. Justify the statement. [Atomic number of Co = 27] 2 + 1 (b) Write the electronic configuration for d4 ion if 0 > P on the basis of crystal field theory. { } 14 26. (a)    …
   Board 20263 marksshort answer
7. Why are haloarenes less reactive towards nucleophilic substitution reaction ? Give two reasons.
   Board 20262 marksshort answer
8. Assertion (A) : The pentaacetate of glucose does not react with H2N – OH. 1 Reason (R) : It indicates the presence of free – CHO group in glucose. { } 10  –  17.               ?     …
   Board 20261 markAssertion-Reason
9. An unripe mango placed in a concentrated salt solution to prepare pickle, shrivels because (A) it gains water due to osmosis (B)i itloseswaterduetoreverseosmosis (C) it gains water due to reverse osmosis (D) itloseswaterduetoosmosis (R) (A), (B), (C) (D): (A) …
   Board 20251 markAssertion-Reason
10. Answer the following : 32. (A) (a) Low spin tetrahedral complexes are not known. (b) Co2+ is easily oxidised to Co3+ in the presence of a strong ligand [At. No. of Co = 27] (c) What type of isomerism is shown by the complex [Co(NHg)6] [Cr(CN)l ? (d) Why a solu…
    Board 20255 markslong answer
11. Using valence bond theory, explain the hybridization and magnetic character of the following : 2 × 1/ = 3 (a) [Co(NH3);]3+ (b) [Ni(CO)4] [At. no. : Co = 27, Ni = 28]
    Board 20253 marksshort answer
12. Name the following coordination compounds according to IUPAC norms : 2 × 1 (a) [Co(NH3) 4(H,O)C]Cl2 (b) [CrCl² (en)2] Cl
    Board 20252 marksshort answer
13. Assertion (A) : [Cr(H,O)s]Cl² and [Fe(H,O)alCl2 are examples of homoleptic complexes. Reason (R) : All the ligands attached to the metal are the same.
    Board 20251 markAssertion-Reason
14. The complex ions [Co(NH3)5 (NO2)]2+ and [Co(NH3)5(ONO)]2+ are called (A) Ionization isomers (B) Linkage isomers (C)Co-ordination isomers (D) Geometrical isomers
    Board 20251 markMCQ
15. Assertion (A) : Vitamin D cannot be stored in our body. Reason (R) : Vitamin D is fat soluble vitamin and is not excreted from the body in urine. 17. (A 3 A·P 0.0030 mol L-1s-11A 0.10M0.075M? (B) N = 2.5× 10-4 18. ffa i af : 2×1 (a) (b) 3 (t1/2) 3g 19. 2×1 (a)…
    Board 20251 markAssertion-Reason
16. Answer any five of the following : 5 1=5 (a) How is the crystal field splitting energy for octahedral complex o) related to that of tetrahedral complex t) ? (b) Write the IUPAC name of the following complex : [PtCl2(en)2] (NO3)2 (c) Write the geometry and magn…
    Board 20245 markslong answer
17. When a certain conductivity cell was filled with 0·05 M KCl solution, it has a resistance of 100 ohm at 25ºC. When the same cell was filled with 0·02 M AgNO3 solution, the resistance was 90 ohm. Calculate the conductivity and molar conductivity of AgNO3 soluti…
    Board 20243 marksshort answer
18. Transition metals have incomplete d-subshell either in neutral atom or in their ions. The presence of partly filled d-orbitals in their atoms makes transition elements different from that of the non-transition elements. With partly filled d-orbitals, these ele…
    Board 20244 marksshort answer
19. (a) Write the formula for the following coordination compound : Potassium tetrahydroxidozincate (II) (b) Arrange the following complexes in the increasing order of conductivity of their solution : [Cr(NH3)5Cl]Cl2, [Cr(NH3)3Cl3], [Cr(NH3)6]Cl3 (c) Identify the …
    Board 20243 marksshort answer
20. Ligand EDTA4 is an example of a : (A) Monodentate ligand (B) Didentate ligand (C) Tridentate ligand (D) Polydentate ligand 4 3. {ZåZ{b{IV {bJÝS> _| go H$m¡Z-gm H$sboQ> g§Hw$b {Z{_©V H$aVm h¡ ? (A) 2 4 C O (B) Cl (C) 2 NO (D) NH3 4. {ZåZ{b{IV _| go {H$g_| sp2 g…
    Board 20241 markMCQ

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