Electrolysis Online test - GSCE O/L

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What does the term 'electrolysis' literally mean? The process of using heat to melt metals The use of electricity to split substances into simpler substances The process of mixing chemicals to produce reactions The process of burning substances in oxygen

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Why must we use Direct Current (DC) instead of Alternating Current (AC) for electrolysis? DC is cheaper than AC DC provides stronger current than AC DC keeps the electrodes fixed as positive and negative, allowing ions to move in one direction DC prevents the electrodes from overheating

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At which electrode does REDUCTION occur during electrolysis? At the anode (positive electrode) At the cathode (negative electrode) At both electrodes equally At neither electrode – reduction doesn't occur in electrolysis

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During electrolysis of copper sulfate solution, Cu ions move toward the cathode. What type of ions are these? Anions (negative ions) Cations (positive ions) Neutral molecules Free electrons

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What chemical change occurs at the anode during electrolysis? Ions gain electrons (reduction) Ions lose electrons (oxidation) Atoms split into smaller particles Molecules dissolve in the electrolyte

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Why can solid sodium chloride NOT be used as an electrolyte for electrolysis? It doesn't contain any ions The ions are locked in a fixed lattice and cannot move It reacts with the electrodes It is too expensive to use

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When water is electrolysed, what is the volume ratio of hydrogen gas to oxygen gas produced? 1:1 1:2 3:1 2:1

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Why do we add dilute sulfuric acid to water before electrolyzing it? To Split the water Molecule in to ions To prevent hydrogen gas from exploding To provide free ions so electricity can flow through the water To neutralize the oxygen produced

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What is the main characteristic of an INERT electrode like graphite or platinum? It dissolves during electrolysis It reacts with the electrolyte to form new products It only conducts electricity without taking part in the chemical reaction It prevents any gas from being produced

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What is the correct balanced equation for the electrolysis of water? H₂O → H₂ + O 2H₂O → 2H₂ + O₂ H₂O → 2H + O 4H₂O → 2H₂ + 2O₂

Electrolysis Online Test – GSCE O/L

Quiz Electrolysis – GSCE O/L

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