Chemical Process
Flux addition during smelting of ore is done to

Remove impurities/gangue
Enhance rate of reaction
Separate slag from metal
Accelerate reduction of ore

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

Aeration of water is effective in CO₂ removal
Water with pH value less than 7, is acidic
Sodium sulphate or sodium carbonate do not cause hardness in water
The zeolite water softening process reduces the hardness of water by not more than 50%

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