JAMB Chemistry 2010 Objective — Question 36

Question 36 of 50 from the Joint Admissions and Matriculation Board (JAMB) Chemistry 2010 Objective paper, with the correct answer and a full explanation.

When iron is exposed to moist air, it gradually rusts. This is due to the formation of

A. an hydrous iron (II) oxide
B. hydrated iron (II) oxide
C. hydrated iron (III) oxideCorrect
D. anhydrous iron (III) oxide

Explanation

When iron is exposed to water and oxygen, it gradually rusts; rusting of iron is the formation of hydrated iron (III) oxide.

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