Chemical Process
Ceramics are produced from silicates or clayish materials: Which of the following is not a ceramic material?

Slag cement
Porcelain/Potteries
Glasses
Teflon

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

Water with pH value less than 7, is acidic
Aeration of water is effective in CO₂ removal
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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