Chemical Process
A mineral is termed as 'ore', if

The metal present in it is costly
A metal can be economically extracted from it
It contains ≥ 40% metal
All of these

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Chemical Process
Unsaturated oils compared to saturated oils have

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

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