Chemical Process
Temporary hardness of water can be removed by

Filtration (through gravity sand filter)
Addition of lime
Addition of alum (a coagulant)
Boiling

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Chemical Process
Unsaturated oils compared to saturated oils have

Lower melting point & lower reactivity to oxygen
Lower melting point & higher reactivity to oxygen
Higher melting point & higher reactivity to oxygen
Higher melting point & lower reactivity to oxygen

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