Uses of chlorine and chlorate(I)AQA A-Level Chemistry: Mind map

Exam questions on Uses of chlorine and chlorate(I)

1. Chlorine gas is bubbled into water in a laboratory. The pale green solution formed is acidic and has bleaching properties.
   Write an equation for the reaction of chlorine with water that forms chloride ions and chlorate(I) ions, and explain why the reaction is a disproportionation.2 marks
2. A local council treats its drinking water by adding chlorine. A resident complains that chlorine is a poisonous gas and asks why it is added to the water supply.
   Explain why the benefit to health of treating drinking water with chlorine is considered to outweigh its toxic effects.2 marks
3. A swimming pool manager makes a bleach solution by reacting chlorine gas with cold, dilute aqueous sodium hydroxide. She also considers adding chlorine gas directly to the pool water.
   Write an equation for the reaction of chlorine with cold, dilute aqueous sodium hydroxide, name the chlorine-containing compound in the solution that acts as the bleach, and state one other use of the solution.3 marks