O-LevelChemistryElectrolysis5070/11 · May/June 2017 · Q141 Mark

Concentrated aqueous calcium iodide undergoes electrolysis in a similar way to concentrated aqueous sodium chloride. What would be formed at each electrode? product at product at positive electrode negative electrode A iodine calcium B iodine hydrogen C oxygen calcium D oxygen hydrogen

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Aiodine at positive electrode and calcium at negative electrode

Biodine at positive electrode and hydrogen at negative electrode

Coxygen at positive electrode and calcium at negative electrode

Doxygen at positive electrode and hydrogen at negative electrode

✓ Correct answer

B: iodine at positive electrode and hydrogen at negative electrode

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Topic: Electrolysis, O-Level Chemistry (syllabus 5070). Multiple choice, 1 mark.
Source: O-Level Chemistry, May/June 2017 Paper 1 Variant 1, question 14.

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