Chemical Process
__________ is the major constituent of the Portland cement.

Calcium carbonate
Calcium oxide
Calcium sulphate
Tricalcium silicate

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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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Chemical Process
Pasteurisation of milk means

None of these
Killing of organisms present in it by heating it at controlled temperature without changing its natural characteristics
Removal of fatty and albuminous substance from it
Inhibiting the growth of micro-organisms without killing them

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