Chemical Process
White phosphorous is stored under water, because

It does not react with water
Its kindling temperature in dry air is very low
It is poisonous
It is unstable

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Chemical Process
Unsaturated oils compared to saturated oils have

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

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