Multiple choice

The magnesium compound used in libraries for preserving books is

  1. magnesium hydroxide

  2. magnesium nitride

  3. magnesium iodide

  4. magnesium oxide
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Magnesium oxide is a white hygroscopic solid mineral that occurs naturally as periclase and is a source of magnesium. It has an empirical formula of MgO. It is relatively poor dessicant, but because it neutralizes sulphur oxide acids created by oxidation of Kraft-processed papers, it is used by many libraries for preserving books.

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