Discussion

Match the following :

List-I	List-II
(a) Carbonation	(1) The addition of water to the molecular structure of a mineral
(b) Hydrolysis	(2) The reaction of minerals with dissolved CO₂ in water
(c) Chelation	(3) The incorporation of cations from the mineral into organic compounds
(d) Hydration	(4) The decomposition and reaction with water

Answer: B

The correct match is a-2, b-4, c-3, d-1.

Carbonation is the reaction of minerals with carbon dioxide dissolved in water as carbonic acid, as when limestone dissolves (a-2).
Hydrolysis is the decomposition of a mineral by reaction with water, its H\(^{+}\) and OH\(^{-}\) ions replacing cations, as when feldspar turns to clay (b-4).
Chelation is the binding of metal cations from a mineral into organic compounds, the chelating agents released by organisms (c-3).
Hydration is the addition of water to the molecular structure of a mineral, as anhydrite becomes gypsum (d-1).

Each other code gets at least two of these pairs wrong.

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