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Interpreting and interacting with earth systems

Interpreting and interacting with earth systems

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Question 1

During municipal water treatment and in outdoor swimming pools, chlorine is added to sanitise water. However, in the presence of sunlight (UV radiation), chlorine undergoes a rapid photochemical reaction with water rather than forming the weak acid responsible for disinfection.

Which equation correctly represents this decomposition reaction of chlorine in water in the presence of sunlight?

A

Cl2(aq)+H2O(l)⇌HClO(aq)+HCl(aq)Cl_2(aq) + H_2O(l) \rightleftharpoons HClO(aq) + HCl(aq)Cl2​(aq)+H2​O(l)⇌HClO(aq)+HCl(aq)

B

2Cl2(aq)+H2O(l)→2HCl(aq)+Cl2O(aq)2Cl_2(aq) + H_2O(l) \rightarrow 2HCl(aq) + Cl_2O(aq)2Cl2​(aq)+H2​O(l)→2HCl(aq)+Cl2​O(aq)

C

2Cl2(aq)+2H2O(l)→4HCl(aq)+O2(g)2Cl_2(aq) + 2H_2O(l) \rightarrow 4HCl(aq) + O_2(g)2Cl2​(aq)+2H2​O(l)→4HCl(aq)+O2​(g)

D

Cl2(aq)+H2O(l)→2HCl(aq)+O(g)Cl_2(aq) + H_2O(l) \rightarrow 2HCl(aq) + O(g)Cl2​(aq)+H2​O(l)→2HCl(aq)+O(g)

Markscheme

Interpreting and interacting with earth systems Questions

  1. GCSE
  2. /Chemistry
  3. /Interpreting and interacting with earth systems

32 exam-style questions on OCR GCSE Chemistry Interpreting and interacting with earth systems. Each one has a worked solution and a mark scheme showing where the marks go.

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