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Iron oxide (rust)
Sodium chloride (salt)
Ammonia
Calcium carbonate
Limescale
Ethanol
Beginning with H
Hydrochloric acid
Nitric acid
Sulphuric acid

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Limescale

CaCO₃

Limescale or calcium carbonate is the white chalky deposits found in kettles and pipes — A cacophony is produced by three (CaCO₃) limes playing scales (limescale).

NOTE: A cacophony is a disagreeable sound.

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