Question

In electrochemical series of anions, as we more from top to bottom, of oxidation:

Options

• Increase

• Decreases

• No influence

• Find increases then decreases

Answer 1

Increase

Explanation:

In the electrochemical series of anions (discharge series), anions are arranged in increasing order of their ease of discharge. As you move from top to bottom (from stable ions like \[\ce{SO^{2-}_4}\] and \[\ce{NO^-_3}\] down to Cl⁻, Br⁻, I⁻, and OH⁻), the tendency of the anions to lose electrons and undergo oxidation increases significantly. This means that anions located lower in the series have a lower discharge potential and are preferentially oxidised at the anode.