IGCSE Chemistry Electrolysis

What is the significance of the electrolyte in electrolysis?

• It is a substance that prevents the flow of ions.

• It is a substance that conducts electricity and allows the flow of ions.

• It is a substance that absorbs heat during the process.

• It is a substance that increases the resistance of the solution.

In electrolysis, where does reduction take place?

• At the Anode

• At the Cathode

• In the Electrolyte

• At the Electrode

Define electrolysis.

• Electrolysis is a process that uses heat to combine elements into compounds.

• Electrolysis is a chemical process that uses electricity to break down compounds into their individual elements.

• Electrolysis is a method of purifying metals using chemical reactions.

• Electrolysis is a technique for measuring electrical resistance in materials.

What is the difference between anode and cathode?

• The anode is negatively charged and attracts cations, while the cathode is positively charged and attracts anions.

• The anode is positively charged and attracts anions, while the cathode is negatively charged and attracts cations.

• The anode and cathode are both positively charged and attract cations.

• The anode is negatively charged and does not attract any ions.

What gas is produced at the negative electrode during the electrolysis of dilute sulfuric acid?

• Oxygen

• Nitrogen

• Hydrogen

• Carbon Dioxide

What is the relationship between electrolysis and redox reactions?

• Electrolysis is a process that only involves oxidation.

• Electrolysis involves redox reactions where oxidation and reduction occur simultaneously.

• Electrolysis is unrelated to redox reactions.

• Electrolysis only involves reduction reactions.

What gas is collected at the anode when sodium chloride solution is electrolyzed?

• Oxygen gas

• Hydrogen gas

• Chlorine gas

• Nitrogen gas

What is the purpose of using a dilute acid in electrolysis?

• A dilute acid increases the temperature of the solution.

• A dilute acid provides a sufficient number of ions for conduction without excessive heat generation.

• A dilute acid prevents the formation of gas bubbles during electrolysis.

• A dilute acid enhances the color of the solution during electrolysis.

What is the effect of increasing the concentration of the electrolyte on the rate of electrolysis?

• Increasing the concentration generally decreases the rate of electrolysis.

• Increasing the concentration has no effect on the rate of electrolysis.

• Increasing the concentration generally increases the rate of electrolysis.

• Increasing the concentration may lead to a decrease in the efficiency of electrolysis.

What happens to ions at the cathode during electrolysis?

• Ions gain electrons and are reduced.

• Ions lose electrons and are oxidized.

• Ions remain unchanged and do not react.

• Ions are converted into gas and escape.