Electrochemistry

Electrochemistry Marking Scheme This is the marking scheme for quiz: C4 - Electrochemistry Quiz Topic Guide: C4 - Electrochemistry Section A: Multiple Choice (5 Marks) D [1] (Anode is positive; oxidation is loss of electrons) C [1] (Bromine gas $\text{Br}_2$ is reddish-brown) B [1] (In aqueous $\text{NaCl}$, $\text{H}^+$ is reduced at cathode instead of $\text{Na}^+$) B [1] (Object to be plated is always the cathode) B [1] (Water is the only product) Section B: Short Answer (15 Marks) Process: ...

Electrochemistry Quiz Duration: 45 Minutes Total Marks: 30 Section A: Multiple Choice (5 Marks) In an electrolytic cell, the electrode where oxidation occurs is the: A. Cathode (negative) B. Cathode (positive) C. Anode (negative) D. Anode (positive) What is the observation at the anode during the electrolysis of molten lead(II) bromide ($\text{PbBr}_2$)? A. Grey metallic deposit B. Colorless bubbles of gas C. Reddish-brown fumes D. Pale green gas Which of the following is correct for the electrolysis of concentrated aqueous sodium chloride ($\text{NaCl}$)? A. Sodium metal forms at the cathode. B. Hydrogen gas forms at the cathode. C. Oxygen gas forms at the anode. D. Chlorine gas forms at the cathode. ...