Electrochemistry

Each subtopic includes About section, revision page link, 10 preview questions, and practice CTAs.

Electrolysis

Subtopic

Electrolysis under Electrochemistry for Grade 12 IGCSE.

About Topic & Revision

Preview questions (no answers)

1.
$Which of the following is the correct half-equation for the discharge of oxygen from water in acidic conditions?$
A. $2H_{2}O \rightarrow O_{2} + 4H^{+} + 4e^{-}$
B. $O_{2} + 4H^{+} + 4e^{-} \rightarrow 2H_{2}O$
C. $H_{2}O + e^{-} \rightarrow H + OH^{-}$
D. $2O^{2-} \rightarrow O_{2} + 2e^{-}$
2.
$In a school experiment, if the universal indicator in the electrolyte turns purple around the cathode during the electrolysis of brine, it indicates the presence of:$
A. $Hydrogen ions$
B. $Chloride ions$
C. $Hydroxide ions$
D. $Sodium ions$
3.
$Which of the following is true for the electrolysis of molten aluminum oxide?$
A. $Aluminum is formed at the anode$
B. $Oxygen is formed at the cathode$
C. $Aluminum is formed at the cathode$
D. $Carbon dioxide is formed at the cathode$

Download the worksheet for Electrochemistry - Electrolysis to practice offline. It includes additional chapter-level practice questions.

Electroplating

Subtopic

Electroplating under Electrochemistry for Grade 12 IGCSE.

About Topic & Revision

Preview questions (no answers)

1.
$Which terminal of a battery provides the electrons that flow to the cathode?$
A. $Positive terminal$
B. $Negative terminal$
C. $Both terminals$
D. $Neither terminal$
2.
$In the electroplating of a spoon with silver, what is the oxidation half-reaction?$
A. $Ag^{+} + e^{-} \rightarrow Ag$
B. $2H_{2}O \rightarrow O_{2} + 4H^{+} + 4e^{-}$
C. $Ag \rightarrow Ag^{+} + e^{-}$
D. $Cu \rightarrow Cu^{2+} + 2e^{-}$
3.
$What is the effect of using a higher concentration of metal ions in the electrolyte?$
A. $It slows down the reaction$
B. $It may increase the rate of deposition$
C. $It changes the direction of the current$
D. $It prevents the anode from dissolving$

Download the worksheet for Electrochemistry - Electroplating to practice offline. It includes additional chapter-level practice questions.

Hydrogen fuel cells

Subtopic

Hydrogen fuel cells under Electrochemistry for Grade 12 IGCSE.

About Topic & Revision

Preview questions (no answers)

1.
$H_2$
A. $It is blue in color$
B. $It is much denser than air$
C. $It is colorless and odorless$
D. $It is a liquid at room temperature$
2.
$O_2$
A. $1$
B. $2$
C. $3$
D. $4$
3.
$Which of the following is a safety concern regarding hydrogen gas storage?$
A. $It is highly flammable$
B. $It is highly toxic to breathe$
C. $It causes acid rain$
D. $It is radioactive$

Download the worksheet for Electrochemistry - Hydrogen fuel cells to practice offline. It includes additional chapter-level practice questions.

Electrochemistry - Grade 12 Chemistry (IGCSE) | Krit.club