Science — AI-generated practice question

The chlor-alkali process involves passing electricity through an aqueous solution of sodium chloride (brine). The balanced chemical equation is:

$$2\text{NaCl}(aq) + 2\text{H}_2\text{O}(l) \xrightarrow{\text{electricity}} 2\text{NaOH}(aq) + \text{Cl}_2(g) + \text{H}_2(g)$$

The products formed are sodium hydroxide (NaOH), chlorine gas (at anode), and hydrogen gas (at cathode).

Source: Chapter 2, Acids, Bases and Salts

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• Examiners expect the correct balanced equation with state symbols and the word "electricity" above the arrow — these earn the marks.
• The three products (NaOH, Cl₂, H₂) must all be mentioned; missing any one costs a mark.
• The name "chlor-alkali" comes from the products: chlor = chlorine, alkali = NaOH. Mentioning this context can help in descriptive parts but is not required here.