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WAEC Agriculture 2016 Paper

Question : 14

Total: 53

In chemical weathering of rocks, the equation Fe,₂O₃+3H₂O → Fe₂O₃3H₂O represents

Solution:

Concept:

Hydration is the addition of water molecules to a mineral to form a new hydrated compound.

Explanation:

The given equation shows iron(III) oxide reacting with water.

\mathrm{Fe_2O_3 + 3H_2O \rightarrow Fe_2O_3 \cdot 3H_2O}

Here, water is chemically absorbed into the compound.

This forms hydrated iron(III) oxide, which is a new product.

Carbonation, solution, and oxidation do not match this reaction.

Therefore, the equation represents hydration.

Answer:

B. hydration

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