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Describe a test to identify the gas used to sterilise water. [2 marks] Test Result

Question

Describe a test to identify the gas used to sterilise water. [2 marks] Test Result

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Solution

Test: Collect a sample of the gas and bubble it through a solution of potassium iodide (KI) and starch.

Result: If the gas is chlorine, the solution will turn blue-black due to the formation of iodine-starch complex.

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