JAMB Chemistry 2007 Objective — Question 36

Question 36 of 50 from the Joint Admissions and Matriculation Board (JAMB) Chemistry 2007 Objective paper, with the correct answer and a full explanation.

The reddish-brown rust on iron roofing sheets consists of

A. FeO.H2O
B. Fe2O3.3H2OCorrect
C. Fe3O4.2H2O
D. Fe3+(H2O)6

Explanation

Rust is hydrated iron(III) oxide, with the formula Fe2O3.xH2O (commonly written Fe2O3.3H2O).

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