Chemical Process
Hydrocynic acid (HCN) is used as an insecticide for

Controlling timber degradation by ants
Potato beetle
Citrus fruits
Controlling poultry lice

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

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

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