Which of the following is not responsible for causing permanent hardness of water ?

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Low temperature carbonisation of coal takes place at _______________ °C ?

A. 300 B. 1100 C. 700 D. 900...

Penicillin is made employing _______________ fermentation process?

A. Continuous B. Aerobic batch C. Anaerobic batch D. None of these...

Glauber’s salt is chemically ?

A. Calcium sulphate B. Potassium sulphate C. Potassium chlorate D. None of these...

Which of the following is an additional step in the manufacture of paper from bagasse as compared to that from bamboo ?

A. Depithing B. Digestion C. Bleaching D. None of these...

Lime and soda ash are added to water to remove ___________________?

A. Bicarbonates & sulphates of calcium and magnesium B. Undesirable taste and odour C. Bacteria D. Its corrosiveness...