Electrolysis

Medium

A student electrolyses dilute sulfuric acid and measures the volume of oxygen gas produced at the anode over time.

The table below shows their results:

One of the results in the table is anomalous. State the time (in minutes) at which this anomalous result was recorded.

[1]

Using the remaining, non-anomalous data, calculate the rate of oxygen gas production in $cm3/min\text{cm}^3/\text{min}$ .

[2]

Dilute sodium chloride solution contains the following particles:

$H+Na+OH−Cl−H2O\text{H}^+ \quad \text{Na}^+ \quad \text{OH}^- \quad \text{Cl}^- \quad \text{H}_2\text{O}$

Which of these particles are attracted to the negative electrode (cathode)?

[2]

Complete the following statements about the electrolysis of molten salts:

For molten sodium bromide ( $NaBr\text{NaBr}$ ), the product formed at the positive electrode (anode) is ______________.
For molten zinc chloride ( $ZnCl2\text{ZnCl}_2$ ), the product formed at the negative electrode (cathode) is ______________.

[2]

Electrolysis Questions