Chemical Process
Systemic insecticides

Emit poisonous vapour
Are stomach poisons
Kill insects following external bodily contact
Are absorbed throughout the plant

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Chemical Process
During the manufacture of sulphuric acid, the temperature of molten sulphur is not increased beyond 160°C, as

It decomposes on further increasing the temperature
None of these
Its viscosity is not reduced on further heating (hence pressure drop on pumping it, cannot be further reduced)
It is very corrosive at elevated temperature

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

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