Chemical Process
High purity nitrogen is used in

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

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Chemical Process
Pick out the true statement pertaining to water treatment.

Activated carbon can be used for taste & odour control without subsequent filtration
Slow sand filters can remove colour completely
Normally, the turbidity is removed by adding a coagulent prior to sedimentation
Application of activated carbon reduces the temporary hardness of water

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