MDCAT Chemistry — Electrochemistry
Electrochemistry is a core Chemistry topic in the PMDC MDCAT syllabus, covering 5 subtopics. Below are the subtopics to revise, how often the topic appears in past papers, and real past-paper MCQs to try.
Subtopics (5)
- Balancing Redox Equations
- Galvanic Cell (Salt Bridge)
- Oxidation and Reduction
- Redox Reactions
- Standard Hydrogen Electrode (SHE)
How Electrochemistry is tested
Across the 16 MDCAT past papers on ParhaiKrlo, Electrochemistry accounts for 40 questions. It appears in 15 of them, about 2.7 questions a paper. The heaviest was MDCAT 2018, with 6 questions, and the most recent is MDCAT 2025, with 3.
| Paper | Questions |
|---|---|
| MDCAT 2025 | 3 |
| MDCAT 2024 | 3 |
| MDCAT 2022 | 1 |
| MDCAT 2019 | 3 |
| MDCAT 2018 | 6 |
| MDCAT 2017 | 1 |
| MDCAT 2016 | 2 |
| MDCAT 2015 | 4 |
| MDCAT 2014 | 3 |
| MDCAT 2013 | 2 |
| MDCAT 2012 | 2 |
| MDCAT 2011 | 2 |
| MDCAT 2010 | 3 |
| MDCAT 2009 | 4 |
| MDCAT 2008 | 1 |
Electrochemistry MCQs from the MDCAT past papers
Try each one before opening the answer. Each comes with a short explanation.
- Q1 · MDCAT 2025 · Electrochemistry
The order of ease of reduction of H⁺, Cu²⁺ and Ag⁺ is:
- A.H⁺ > Cu²⁺ > Ag⁺
- B.H⁺ > Ag⁺ > Cu²⁺
- C.Ag⁺ > Cu²⁺ > H⁺
- D.Cu²⁺ > H⁺ > Ag⁺
Show answer
Answer: C. Ag⁺ > Cu²⁺ > H⁺ — Ease of reduction: Ag+ > Cu2+ > H+, based on standard reduction potentials.
- Q2 · MDCAT 2024 · Electrochemistry
Oxidation number of 'Mn' in KMnO₄ is
- A.0
- B.+1
- C.-7
- D.+7
Show answer
Answer: D. +7 — Mn's oxidation number in KMnO4 is +7.
- Q3 · MDCAT 2022 · Electrochemistry
An electrochemical cell is based upon which reaction?
- A.Acid-base reaction
- B.Redox reaction
- C.Nuclear reaction
- D.Neutralization reaction
Show answer
Answer: B. Redox reaction — Electrochemical cells operate based on redox (oxidation-reduction) reactions, transferring electrons between electrodes.