Question

name the process which take place when a red litmus paper turn white when dropped into chloride water

Answer 1

Explanation:

Chlorine gas bleaches the damp litmus (red or blue). Bleaching is an oxidation process. If you are considering the colour change only - refer to it as bleaching. If you are considering the reaction mechanism and how the chemicals which provide the colour are changed, then refer to it as oxidation.

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Answer 2

Answer:

Bleaching is the name of the process.

Explanation:

• Chlorine gas is both an oxidising agent and an acidic gas.
• Chlorine gas in water is a bleach, and bleaching is an oxidation process.
• Thus, the damp litmus is bleached by chlorine gas (red or blue).
• If one pays close attention, they may notice that the blue litmus becomes red immediately before the bleaching process begins when it is placed in the chlorine water.
• This occurs because chlorine gas must first dissolve in the water that the paper has absorbed before bleaching can take place. This results in a disproportionate reaction and chlorine forms a +1 and −1 oxidation state in different compounds.
• When hydrogen chloride is formed, blue litmus paper turns red.

      Cl₂+ H₂O ⇒ HClO + HCl  but due to the reaction:

     HClO ⇒ HCl + [O] (nascent oxygen)

Since the formation of nascent oxygen occurs when HClO dissociates, which is an oxidising agent, HClO is the bleach in the reaction. As a result, the litmus paper becomes white and bleached.

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