2018 source guide · Chemistry

NEET 2018 Chemistry Electrochemistry 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.

Practice 118 verified questions →Check official NTA archive ↗

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 1 · difficulty 2/5

A mercury cell maintains a nearly constant voltage throughout its entire working life because:

A. Zinc amalgam is used as the anode
B. HgO is a powerful oxidising agent
C. KOH is used as the electrolyte
D. The overall cell reaction does not involve any ion whose concentration changes during operation

Example 2 · difficulty 3/5

The molar conductivity of 0.1 M acetic acid is 4.0 S cm² mol⁻¹. If its limiting molar conductivity is 400 S cm² mol⁻¹, the degree of dissociation (α) and dissociation constant (Ka) of acetic acid are respectively:

A. α = 0.1, Ka = 1 × 10⁻³
B. α = 0.01, Ka = 1 × 10⁻⁵
C. α = 0.01, Ka = 1 × 10⁻³
D. α = 0.1, Ka = 1 × 10⁻⁵

Example 3 · difficulty 1/5

Which comparison between metallic conduction and electrolytic conduction is correct?

A. Metallic conduction occurs through electrons without transfer of matter, whereas electrolytic conduction occurs through moving ions and may involve chemical changes at electrodes.
B. Both types of conduction occur only through electrons, but electrolytic conduction additionally transfers solvent molecules.
C. Metallic conduction requires chemical decomposition of the metal, whereas electrolytic conduction leaves the electrolyte chemically unchanged.
D. Both types transfer matter across the conductor, but only metallic conduction depends on mobile ions.

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

Electrochemistry →

Frequently asked questions

Are these official NEET 2018 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 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.