Magnesium and calcium ______________ cause temporary hardness of water ?

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Hydrocyanic acid (HCN) is used as an insecticide for____________________?

A. Controlling timber degradation by ants B. Controlling poultry lice C. Potato beetle D. Citrus fruits...

The most commonly used substance to speed up the sedimentation of sewage is___________________?

A. Lime B. Sulphuric acid C. Chlorine D. Sodium bisulphite...

Paper pulp produced by Kraft/sulphate process is__________________ ?

A. Bleached easily B. Dull white in color C. Strong fibrous D. Dark colored...

Frasch process is for______________________?

A. Making oxygen B. Producing helium C. Mining sulphur D. Making nitrogen...

Refractory bricks burnt at very high temperature have got______________?

A. Greater resistance to corrosion by slags B. Less resistance to corrosion by slags C. High spalling tendency D. None of these...