Ion Migration in Electrolysis

Steps:

• Identify electrodes: Cathode is negative, anode is positive.
• Recall charges: Cations are positive ions, anions are negative ions.
• Apply attraction: Opposite charges attract, so cations move to negative cathode, anions to positive anode.
• Evaluate options: Match statements to correct migration rules.

Why D is correct:

• Cations, being positive, are attracted to the negatively charged cathode per the principle of electrostatic attraction in electrolysis.

Why the others are wrong:

• A: Anions are negative and move to the positive anode, not cathode.
• B: Cations move to the negative cathode, not positive anode.
• C: Anions are negative, not positive, so this misstates ion types.

Final answer: D