Electrolysis and Selective Discharge Quiz

What determines which ion is discharged during electrolysis when concentrations are high?

• The ion with the highest charge

• The ion with the highest concentration

• The ion with the lowest atomic number

• The ion with the highest atomic mass

In the electrolysis of dilute hydrochloric acid, which ion is discharged at the anode?

• Chloride ion

• Sulfate ion

• Hydroxide ion

• Hydrogen ion

What is the product formed at the cathode during the electrolysis of dilute hydrochloric acid?

• Hydrogen gas

• Water

• Oxygen gas

• Chlorine gas

Which test is used to confirm the presence of oxygen gas during electrolysis?

• Bromine water test

• Litmus paper test

• Burning wooden splinter

• Glowing wooden splinter

What color change occurs when chlorine gas is released during the electrolysis of concentrated hydrochloric acid?

• Colorless to greenish-yellow

• Greenish-yellow to colorless

• Red to blue

• Blue to red

Why is chloride ion discharged instead of hydroxide ion in concentrated hydrochloric acid?

• Hydroxide ion is unstable

• Chloride ion has a higher concentration

• Hydroxide ion is not present

• Chloride ion is lower in the electrochemical series

Which ions are not discharged even if their concentration is high?

• Bromide ions

• Chloride ions

• Sodium ions

• Hydroxide ions

What is the reason sodium ions are not discharged despite high concentration?

• They are too low in the electrochemical series

• They are too high in the electrochemical series

• They form a precipitate

• They react with water

Which ions are more likely to be discharged if they are close to hydrogen in the electrochemical series?

• Nitrate ions

• Chloride ions

• Sulfate ions

• Fluoride ions

What is a key factor in determining the discharge of ions during electrolysis?

• The temperature of the solution

• The color of the solution

• The pH of the solution

• The concentration and position in the electrochemical series