Building Materials
Slacking of lime is affected by

None of these
Immersing the lime in water
Keeping it exposed to air
Crushing the lime lumps

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Building Materials
Asbestos

Contains iron oxide and alumina
All of these
Is composed of hydrous silicates of calcium and magnesium (CaSiO3, 3MgSiO3)
Is a natural fibrous mineral substance

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