Multiple choice

A pacemaker is a small device placed in the chest which helps to control abnormal heart rhythms.The lithium salt used in the batteries of artificial pacemakers is

  1. lithium nitride

  2. lithium nitrite

  3. lithium amide

  4. lithium iodide
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D Correct answer
Explanation

Lithium iodide, or LiI, is a compound of lithium and iodine. When exposed to air, it becomes yellow in colour, due to the oxidation of iodide to iodine. It is used as an electrolyte for high temperature batteries. It is also used for long life batteries as required, for example, by artificial pacemakers. The solid is used as a phosphor for neutron detection.

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