Chemistry: The Molecular Nature of Matter and Change 7th Edition

Published by McGraw-Hill Education
ISBN 10: 007351117X
ISBN 13: 978-0-07351-117-7

Chapter 21 - Problems - Page 971: 21.89

Answer

See explanation below.

Work Step by Step

In the electrolysis of a molten mixture of KI and MgF2, either iodide or fluoride ions can be oxidized at the anode. I is less electronegative than Fluorine. So at anode Iodine gas is produced. Either potassium or magnesium is formed at cathode. Magnesium has higher ionization energy than potassium. Hence at cathode magnesium is formed.
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