https://soh-cah-toa.pages.dev/tags/c4/ Recent content in C4 on SOH-CAH-TOA Hugo en-us Thu, 02 Jul 2026 22:59:59 +0700 https://soh-cah-toa.pages.dev/mark-schemes/chemistry/electrochemistry_ms/ Thu, 02 Jul 2026 22:59:59 +0700 https://soh-cah-toa.pages.dev/mark-schemes/chemistry/electrochemistry_ms/ <h1 id="electrochemistry-marking-scheme">Electrochemistry Marking Scheme</h1> <blockquote> <p>This is the marking scheme for quiz: <a href="https://soh-cah-toa.pages.dev/quizzes/chemistry/electrochemistry_quiz/">C4 - Electrochemistry Quiz</a><br> Topic Guide: <a href="https://soh-cah-toa.pages.dev/guides/chemistry/electrochemistry/">C4 - Electrochemistry</a></p> </blockquote> <h2 id="section-a-multiple-choice-5-marks">Section A: Multiple Choice (5 Marks)</h2> <ol> <li><strong>D</strong> [1] (Anode is positive; oxidation is loss of electrons)</li> <li><strong>C</strong> [1] (Bromine gas $\text{Br}_2$ is reddish-brown)</li> <li><strong>B</strong> [1] (In aqueous $\text{NaCl}$, $\text{H}^+$ is reduced at cathode instead of $\text{Na}^+$)</li> <li><strong>B</strong> [1] (Object to be plated is always the cathode)</li> <li><strong>B</strong> [1] (Water is the only product)</li> </ol> <hr> <h2 id="section-b-short-answer-15-marks">Section B: Short Answer (15 Marks)</h2> <ol start="6"> <li> <p><strong>Process</strong>:</p> https://soh-cah-toa.pages.dev/quizzes/chemistry/electrochemistry_quiz/ Thu, 02 Jul 2026 22:59:41 +0700 https://soh-cah-toa.pages.dev/quizzes/chemistry/electrochemistry_quiz/ <h1 id="electrochemistry-quiz">Electrochemistry Quiz</h1> <p><strong>Duration</strong>: 45 Minutes <strong>Total Marks</strong>: 30</p> <hr> <h2 id="section-a-multiple-choice-5-marks">Section A: Multiple Choice (5 Marks)</h2> <ol> <li> <p>In an electrolytic cell, the electrode where oxidation occurs is the:<br> A. Cathode (negative)<br> B. Cathode (positive)<br> C. Anode (negative)<br> D. Anode (positive) <br> <br></p> </li> <li> <p>What is the observation at the anode during the electrolysis of molten lead(II) bromide ($\text{PbBr}_2$)?<br> A. Grey metallic deposit<br> B. Colorless bubbles of gas<br> C. Reddish-brown fumes<br> D. Pale green gas <br> <br></p> </li> <li> <p>Which of the following is correct for the electrolysis of concentrated aqueous sodium chloride ($\text{NaCl}$)?<br> A. Sodium metal forms at the cathode.<br> B. Hydrogen gas forms at the cathode.<br> C. Oxygen gas forms at the anode.<br> D. Chlorine gas forms at the cathode. <br> <br></p>