Jump to a section

Chemistry - Coordination Compounds

Practise 22 NEST (NISER) previous year questions on Coordination Compounds, compiled from papers spanning 2015 to 2026. Each question is pulled directly from the actual exam paper it appeared in, so you're practising in the exact style and difficulty NEST (NISER) tests.

Coordination Compounds has been asked in 11 of the 16 years of NEST (NISER) papers analysed (2011–2026), with 22 questions in all. 0% of them were easy, 82% moderate and 18% tough. Most of its questions came from 2024, with 4 questions that year. In the last three years (2024–2026) it had 8 questions across 4 papers, about 2 per paper.

The chapter's 5 topics are not weighted equally: Werner's theory and Valence Bond Theory (8 questions, 36%), Crystal Field Theory (6 questions, 27%), and Isomerism of coordination compounds (5 questions, 23%) have been asked the most. Werner's theory and Valence Bond Theory has also led over the last five years, with 5 questions. Werner's theory and Valence Bond Theory has produced the most tough questions (2).

  1. 1The increasing order of acidic strength for the aqua complexes , , , and is:2026Stability of complex ion
  2. 2Consider the following complex ions: , , , and . The complex ions that are expected to show diamagnetic behavior at room temperature are:2026Werner's theory and Valence Bond Theory
  3. 3A first-row transition metal dipositive ion forms an octahedral aqua complex , which is paramagnetic. The addition of excess ammonia to give2025Werner's theory and Valence Bond Theory
  4. 4The metal ion that does not form a stable metal carbonyl complex is2025Crystal Field Theory
  5. 5The spin only magnetic moment of a manganese (atomic number 25) amine complex is 2.83 BM . The oxidation state of Mn in the complex is2024 (Session 1)Terminology of coordination compounds
  6. 6Cobalt(III) chloride on reaction with ammonia yields an octahedral compound , which exists in two isomeric forms, one colored green and the 2024 (Session 2)Isomerism of coordination compounds
  7. 7Consider the coordination compounds , and , denoted respectively, by , and . The correct order of wavelengths of light absorbed by the compo2024 (Session 2)Werner's theory and Valence Bond Theory
  8. 8The number of geometrical isomers possible for the complex is2024 (Session 2)Isomerism of coordination compounds
  9. 9Negatively charged monodentate strong field ligand and weak field ligand form complexes and , respectively, under certain reaction condition2023 (Session 1)Crystal Field Theory
  10. 10The largest crystal field stabilization energy is for2023 (Session 2)Crystal Field Theory
  11. 11The spin-only magnetic moment of ion in Bohr Magneton is2022 (Session 1)Werner's theory and Valence Bond Theory
  12. 12The correct statement(s) about and is/are2022 (Session 1)Werner's theory and Valence Bond Theory
  13. 13Preview not available - open to view this question.2022 (Session 2)Isomerism of coordination compounds
  14. 14in an acidified aqueous solution forms an complex. In this complex ion, the hybridization of Al is2021 (Session 1)Werner's theory and Valence Bond Theory
  15. 15The species which possesses the highest spin angular momentum is:2020 (Session 1)Werner's theory and Valence Bond Theory
  16. 16Among the complexes given below, the compound(s) that exhibit(s) optical isomerism is(are): (i) cis- ; (ii) trans- ; (iii) cis- ; (iv) trans2020 (Session 2)Isomerism of coordination compounds
  17. 17The CFSE (in Dq) and the spin only magnetic moment of metal ions in an octahedral environment is plotted below as a function of number of el2020 (Session 2)Crystal Field Theory
  18. 18The transition metal M in the diamagnetic complex, , is2019 (Session 2)Werner's theory and Valence Bond Theory
  19. 19Prussian blue, a blue pigment used for paints and fabrics was the first synthetic coordination compound. It has a cubic structure with Fe in2019 (Session 2)Terminology of coordination compounds
  20. 20Complexes and absorb at 700,475 and 310 nm , respectively. The ligands and Z most likely are, respectively,2018Crystal Field Theory
  21. 21Several octahedral complexes are possible from combinations of and . The correct statement(s) regarding the octahedral coordination entities2016Isomerism of coordination compounds
  22. 22Among the complex ions and , the one that shows strongest distortion from regular octahedral structure is2015Crystal Field Theory

Frequently Asked Questions

1.How many questions are available for Coordination Compounds?

This chapter includes 22 questions compiled from NEST (NISER) papers spanning 2015 to 2026.

2.Are these questions only from NEST (NISER), or from other exams too?

These are NEST (NISER) questions specifically for the Coordination Compounds chapter. Questions from other exams like JEE Main or NTA Abhyas (JEE Main) are organised separately under their respective exam sections.

3.Is Coordination Compounds an important chapter for NEST (NISER) Chemistry?

Coordination Compounds has appeared in 11 of the 16 years of NEST (NISER) papers covered here, with 22 questions across 15 papers - about one per paper it appears in.

4.What is the difficulty level of Coordination Compounds questions in NEST (NISER)?

Of the 22 questions analysed for this chapter, 0% are easy, 82% moderate and 18% tough. 2024 had the most, with 4 questions.

5.Which topics in Coordination Compounds should I focus on?

These topics have carried the most weightage in Coordination Compounds:

  • Werner's theory and Valence Bond Theory - 8 questions (36%)
  • Crystal Field Theory - 6 questions (27%)
  • Isomerism of coordination compounds - 5 questions (23%)
  • Werner's theory and Valence Bond Theory has produced the most tough questions (2).
6.Is Coordination Compounds's weightage in NEST (NISER) going up or down?

Across all 15 papers analysed, Coordination Compounds has averaged about 1.5 questions per paper. In the last three years (2024–2026), that average has risen, at about 2.0 questions per paper. Use the year-wise numbers on this page for the exact trend before you decide how much time to give it.