Chemical Process
Which of the following is the most adverse factor challenging the choice of mercury electrolytic cell process for the production of caustic soda?

Pollution of water stream by mercury
Non-availability of high purity mercury
High cost of mercury
High specific gravity of mercury

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

The zeolite water softening process reduces the hardness of water by not more than 50%
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

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