Inorganic Chemistry MCQs for SLET 2026

Inorganic Chemistry Practice MCQs for SLET 2026

Very useful for Assistant Professor Exams.

50 Questions: +1 mark correct • −0.25 mark wrong • Suggested time: 50 minutes

Time Left: 50:00

1. The coordination number and oxidation state of Cr in [Cr(NH₃)₆]Cl₃ are respectively:

(a) 3 and +3 (b) 6 and +3 (c) 6 and +6 (d) 3 and +6

2. According to VBT, the hybridization in [Ni(CN)₄]²⁻ is:

(a) sp³ (b) dsp² (c) d²sp³ (d) sp³d²

3. Which complex is diamagnetic?

(a) [CoF₆]³⁻ (b) [Ni(NH₃)₆]²⁺ (c) [Fe(CN)₆]⁴⁻ (d) [Co(NH₃)₆]³⁺

4. The crystal field splitting energy (Δ_o) is larger for:

(a) Weak field ligands (b) Strong field ligands (c) Neutral ligands (d) Anionic ligands always

5. The IUPAC name of [Co(en)₃]Cl₃ is:

(a) Tris(ethylenediamine)cobalt(III) chloride (b) Triamminecobalt(III) chloride (c) Chlorotris(ethylenediamine)cobalt(III) (d) Cobalt tris(ethane-1,2-diamine) chloride

6. Geometrical isomerism is shown by:

(a) [Co(NH₃)₆]³⁺ (b) [Co(NH₃)₄Cl₂]⁺ (c) [Co(en)₃]³⁺ (d) [Ni(CO)₄]

7. The 18-electron rule is followed by:

(a) [Fe(CO)₅] (b) [Ni(CO)₄] (c) [Cr(CO)₆] (d) All of these

8. Lanthanide contraction is due to:

(a) Poor shielding of 4f electrons (b) Good shielding of 5d electrons (c) Increase in nuclear charge (d) Both (a) and (c)

9. The most stable oxidation state of lanthanides is:

(a) +2 (b) +3 (c) +4 (d) +1

10. Haemoglobin contains:

(a) Fe²⁺ (b) Fe³⁺ (c) Mg²⁺ (d) Cu²⁺

11. The formula of borazine is:

(a) B₃N₃H₆ (b) B₃N₃H₃ (c) B₄N₄H₈ (d) BN

12. Which is called inorganic benzene?

(a) Borax (b) Borazole (c) Boron nitride (d) Boric acid

13. The geometry of [NiCl₄]²⁻ is:

(a) Square planar (b) Tetrahedral (c) Octahedral (d) Trigonal bipyramidal

14. CFSE for d⁵ high spin octahedral complex is:

(a) -0.4 Δ_o (b) 0 (c) -2.0 Δ_o (d) +0.6 Δ_o

15. Hard acids prefer to bind with:

(a) Hard bases (b) Soft bases (c) Neutral ligands (d) None

16. The magnetic moment of [MnBr₄]²⁻ is close to:

(a) 1.73 BM (b) 4.9 BM (c) 5.9 BM (d) 0 BM

17. Which shows linkage isomerism?

(a) [Co(NH₃)₅NO₂]²⁺ (b) [Co(en)₃]³⁺ (c) [Pt(NH₃)₄]²⁺ (d) [Ni(CO)₄]

18. The oxidation state of Fe in Fe₄[Fe(CN)₆]₃ is:

(a) +2 and +3 (b) +3 (c) +2 (d) 0

19. Noble gas compounds are known for:

(a) Xe only (b) Kr and Xe (c) Xe, Kr, Rn (d) All noble gases

20. The strongest oxidizing agent among halogens is:

(a) I₂ (b) Br₂ (c) Cl₂ (d) F₂

21. Interhalogen compound of type AX₇ is:

(a) IF₇ (b) BrF₅ (c) ICl₃ (d) ClF₃

22. The structure of XeF₆ is:

(a) Octahedral (b) Distorted octahedral (c) Square planar (d) Tetrahedral

23. Nitrogen fixation in biology involves:

(a) Nitrogenase enzyme (b) Hemoglobin (c) Chlorophyll (d) Cytochrome

24. Wilkinson's catalyst is used for:

(a) Hydrogenation (b) Polymerization (c) Oxidation (d) Halogenation

25. The EAN of Cr in Cr(CO)₆ is:

(a) 36 (b) 35 (c) 34 (d) 18

26. Fajans' rule is related to:

(a) Polarization (b) Hybridization (c) Bonding (d) Isomerism

27. The colour of transition metal complexes is due to:

(a) d-d transition (b) Charge transfer (c) Both (d) None

28. Actinides show higher oxidation states than lanthanides because:

(a) 5f orbitals are more penetrating (b) Larger size (c) Poor shielding (d) All

29. The ore of aluminium is:

(a) Bauxite (b) Cryolite (c) Both (d) None

30. Which is paramagnetic?

(a) [Zn(NH₃)₄]²⁺ (b) [Cu(NH₃)₄]²⁺ (c) [Ni(NH₃)₆]²⁺ (d) [Pt(NH₃)₄]²⁺

31. Optical isomerism is shown by:

(a) [Co(en)₂Cl₂]⁺ (b) [Co(NH₃)₄Cl₂]⁺ (c) [PtCl₄]²⁻ (d) [NiCl₄]²⁻

32. The ligand in vitamin B₁₂ is:

(a) CN⁻ (b) CO (c) Porphyrin (d) Corrin

33. The geometry of SF₆ is:

(a) Octahedral (b) Trigonal bipyramidal (c) Square pyramidal (d) Tetrahedral

34. HSAB theory was proposed by:

(a) Pearson (b) Sidgwick (c) Werner (d) Pauling

35. Synergic bonding is seen in:

(a) Metal carbonyls (b) Simple salts (c) Ionic compounds (d) None

36. The number of unpaired electrons in [Fe(H₂O)₆]²⁺ is:

(a) 4 (b) 5 (c) 0 (d) 3

37. Which is a chelating ligand?

(a) NH₃ (b) Cl⁻ (c) en (d) H₂O

38. The splitting in tetrahedral field is:

(a) Δ_t = 4/9 Δ_o (b) Δ_t = Δ_o (c) Δ_t = 9/4 Δ_o (d) No splitting

39. Ziegler-Natta catalyst involves:

(a) Ti and Al (b) Pd (c) Pt (d) Ni

40. The radioactive element in lanthanides is:

(a) Pm (b) Eu (c) Gd (d) Lu

41. The common oxidation state of actinides is:

(a) +3 (b) +4 (c) +6 (d) Variable

42. Pseudohalide is:

(a) CN⁻ (b) NO₃⁻ (c) SO₄²⁻ (d) PO₄³⁻

43. The structure of diborane is:

(a) Electron deficient with 3c-2e bonds (b) Normal covalent (c) Ionic (d) None

44. Silicates have basic unit:

(a) SiO₄⁴⁻ (b) SiO₃²⁻ (c) SiO₂ (d) Si

45. The inert pair effect is shown by:

(a) p-block elements (b) d-block (c) f-block (d) s-block

46. Which has highest lattice energy?

(a) NaCl (b) MgO (c) CsI (d) KBr

47. The nuclear reaction for fission is exampled by:

(a) U-235 + n → products (b) Fusion of H (c) Decay (d) All

48. The role of Mg in chlorophyll is:

(a) Central metal (b) Electron transfer (c) Oxygen transport (d) None

49. Ambidentate ligand is:

(a) NO₂⁻ (b) NH₃ (c) H₂O (d) CO

50. The complex with highest stability constant generally has:

(a) Chelating ligands (b) Monodentate (c) Weak ligands (d) None

Congratulations! Quiz Completed