Example 1 · difficulty 4/5
The total number of stereoisomers possible for the complex ion [Co(en)₂Cl₂]⁺ is:
- A. 2
- B. 4
- C. 5
- D. 3
2018 source guide · Chemistry
NEET 2018 Chemistry Coordination Compounds Questions
Use this page to connect the official 2018 paper with current Chemistry practice. NeetVellum does not claim a chapter appeared in that paper until the official question and final key have been mapped.
What to master
nomenclature, isomerism, bonding, crystal fields and magnetic behaviour.
Original practice preview
These are current-syllabus NeetVellum questions, shown separately from historical-paper provenance.
Example 2 · difficulty 3/5
During the leaching of gold with a dilute solution of NaCN in the presence of air, the soluble complex species formed is:
- A. [Au(CN)₄]⁻
- B. [Au(CN)₆]³⁻
- C. [Au(CN)₂]⁻
- D. [Au(CN)₃]
Example 3 · difficulty 2/5
Which statement correctly describes primary and secondary valencies in Werner's theory?
- A. Primary valency corresponds to oxidation state and is usually ionisable, whereas secondary valency corresponds to coordination number and is non-ionisable.
- B. Primary valency equals coordination number, whereas secondary valency equals oxidation state.
- C. Both primary and secondary valencies are always ionisable.
- D. Primary valency is directional, whereas secondary valency is non-directional.
The evidence-first practice loop
- 1. Verify provenanceOfficial paper and final key before accepting a PYQ label.
- 2. Attempt closed-bookExpose the concept or execution gap before rereading.
- 3. Repair and returnClassify the miss and re-practice after a delay.
Canonical chapter practice
Frequently asked questions
Are these official NEET 2018 Chemistry Coordination Compounds PYQs?
No. The previews are original NeetVellum practice questions. A historical item receives a PYQ label only after its official paper and authoritative final answer key are attached. Use the official archive for the source paper.
How should I use the NEET 2018 paper?
Solve the official paper under its original timing, verify against the final key, classify every miss, and then use the linked current-syllabus practice bank to repair the exposed concept.