Example 1 · difficulty 4/5
A first-transition-series element M forms M²⁺ with a 3d⁵ configuration and reaches +7 in the oxide M₂O₇. Identify M and its formal d-electron count in the +7 oxidation state.
- A. Mn; 3d⁰
- B. Cr; 3d⁰
- C. Fe; 3d¹
- D. Mn; 3d²
2025 source guide · Chemistry
NEET 2025 Chemistry D- and F-Block Elements Questions
Use this page to connect the official 2025 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
electronic configurations, oxidation states, colour, magnetism and lanthanoid trends.
Original practice preview
These are current-syllabus NeetVellum questions, shown separately from historical-paper provenance.
Example 2 · difficulty 3/5
Which pair of electronic configurations for the common copper ions is correct?
- A. Cu⁺: [Ar] 3d⁹; Cu²⁺: [Ar] 3d⁸
- B. Cu⁺: [Ar] 3d¹⁰; Cu²⁺: [Ar] 3d⁹
- C. Cu⁺: [Ar] 3d¹⁰ 4s¹; Cu²⁺: [Ar] 3d¹⁰
- D. Cu⁺: [Ar] 3d⁸ 4s²; Cu²⁺: [Ar] 3d⁷ 4s²
Example 3 · difficulty 1/5
What is the direct electronic cause of colour in many aqueous transition-metal ions?
- A. Visible light completely removes a d electron from the ion
- B. Radioactive decay of the metal nucleus emits coloured light
- C. Vibration of the whole hydrated ion occurs without electronic excitation
- D. Visible light promotes an electron from a lower-energy d level to a higher-energy d level
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 2025 Chemistry D- and F-Block Elements 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 2025 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.