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Interactive Grade 10 Science Electrochemistry & Cells Test

Science · Grade 10 · 15 questions · 10 min

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Electrochemistry & Cells

In the electrolysis of dilute sodium chloride solution (brine), which gas is produced at the anode and why?

A.Hydrogen gas, because H⁺ ions are preferentially dischargedB.Chlorine gas, because Cl⁻ ions are more concentrated and preferentially dischargedC.Oxygen gas, because water is oxidised at all concentrationsD.Sodium vapour, because Na⁺ ions are the only cations present

Which of the following correctly identifies the cathode and anode in an electrolytic cell?

A.Cathode is connected to the positive terminal; anode is connected to the negative terminalB.Cathode is connected to the negative terminal; anode is connected to the positive terminalC.Both electrodes are connected to the positive terminalD.The cathode and anode are interchangeable depending on the electrolyte used

During the industrial production of aluminium by the Hall-Héroult process, aluminium oxide (Al₂O₃) is dissolved in molten cryolite and electrolysed. Why is cryolite used rather than simply electrolyzing pure aluminium oxide?

A.Cryolite increases the yield of aluminium produced per mole of electronsB.Cryolite prevents chlorine gas from being released at the anodeC.Cryolite lowers the melting point of aluminium oxide, making the process more energy-efficientD.Cryolite reacts with aluminium to purify it during electrolysis

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