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Chlorine reacts with cold aqueous sodium hydroxide to produce sodium chloride, water and compound X - CIE - A-Level Chemistry - Question 14 - 2018 - Paper 1

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Chlorine reacts with cold aqueous sodium hydroxide to produce sodium chloride, water and compound X. Chlorine reacts with hot aqueous sodium hydroxide to produce so... show full transcript

Worked Solution & Example Answer:Chlorine reacts with cold aqueous sodium hydroxide to produce sodium chloride, water and compound X - CIE - A-Level Chemistry - Question 14 - 2018 - Paper 1

Step 1

What are the oxidation states of chlorine in compound X?

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In cold sodium hydroxide, chlorine undergoes disproportionation. It is reduced to chloride ion (Cl⁻) while producing another species. The oxidation state of chlorine in compound X is therefore -1.

Step 2

What are the oxidation states of chlorine in compound Y?

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In hot sodium hydroxide, chlorine reacts to form sodium hypochlorite (NaClO). In this compound, the oxidation state of chlorine is +1.

Step 3

Select the correct answer for compounds X and Y.

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Based on the oxidation states calculated, compound X has Cl at -1 and compound Y has Cl at +1. Therefore, the correct answer is D: -1 for X and +1 for Y.

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