Example 1 · difficulty 2/5
A solution in a cell of cell constant 1.25 cm⁻¹ has a measured conductance of 4.0 × 10⁻³ S. Its conductivity is:
- A. 5.0 × 10⁻³ S cm⁻¹
- B. 3.2 × 10⁻³ S cm⁻¹
- C. 0.3125 S cm⁻¹
- D. 1.25 × 10⁻³ S cm⁻¹
2020 source guide · Chemistry
NEET 2020 Chemistry Electrochemistry Questions
Use this page to connect the official 2020 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
conductance, electrochemical cells, the Nernst equation and electrolysis.
Original practice preview
These are current-syllabus NeetVellum questions, shown separately from historical-paper provenance.
Example 2 · difficulty 2/5
On raising temperature over an ordinary working range, which trend is generally expected for metallic and electrolytic conductors?
- A. Conductivity increases for both because all charge carriers always become more mobile.
- B. Metallic conductivity generally decreases, whereas electrolytic conductivity generally increases.
- C. Metallic conductivity generally increases, whereas electrolytic conductivity generally decreases.
- D. Conductivity remains constant for metals but becomes zero for electrolytes.
Example 3 · difficulty 2/5
A fixed volume of an electrolyte solution is diluted substantially with water at constant temperature. What happens to its conductivity, and why?
- A. It increases because dilution creates an unlimited number of ions.
- B. It remains unchanged because conductivity is independent of concentration.
- C. It decreases because the number of ions per unit volume becomes smaller.
- D. It becomes equal to metallic conductivity because water supplies electrons.
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 2020 Chemistry Electrochemistry 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 2020 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.