Chemical Process
High purity nitrogen is used in

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

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Chemical Process
DDT stands for

Diphenyl-dichloro-trichloromethane
Diethyl-diphenyl-trichloromethane
Dichloro-diphenyl-trichloroethane
Dichloro-diphenyl-trichloromethane

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