Chemical Process
High purity nitrogen is used in

Neither A nor B
Fire fighting purposes
Both A & B
Making protective gas (95% N₂ + 5% H₂) for annealing of cold rolled steel strip coils

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

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

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