Related Questions

Waste/polluted water discharged from electroplating, blast furnace and coal mining industries contain mainly __________ substances.
A Radioactive
B Organic
C Inorganic
D None of these
Impurities present in brine is normally removed by treatment with
A NH3 and CO2
B Lime and soda ash
C Lime, ammonia and carbon
D All of the above
Oil and grease present in an emulsified state in waste water discharged from industries can be removed by
A Biological oxidation
B Skimming off
C Settling out using chemical reagents
D Chlorination
Water effluent generated in printing industry is decolourised by
A Ion exchange technique
B Reverse osmosis
C Electrolytic decomposition
D Adsorption
The main pollutant in waste water discharged from a petroleum refinery is oil (both in free and emulsified form). Free oil is removed by
A Biological oxygen pond
B Aerated lagoons
C Trickling filters
D Gravity separator having oil skimming devices
Very fine suspended and colloidal impurities are removed from water by a process called
A Sedimentation
B Coagulation
C Disinfection
D Softening
Coal, which is almost pure carbons which hardly has any impurities, which is smokeless and which finds use in the steel industry is called
A Coking coal
B Anthracite
C Bituminous coal
D Lignite
Which of the following rectifiers have been used extensively in supplying direct current for electroplating?
A Copper oxide rectifiers
B Selenium rectifiers
C Mercury arc rectifiers
D Mechanical rectifiers
E None of the above
The metals commonly used for electroplating are
A Gold, Sodium and Chromium
B Chromium, Copper and Nickel
C Nickel, Lead and Chromium
D Gold, Sodium and Potassium
In the electroplating of gold, the electrolyte used is
A Gold chloride
B Gold nitrate
C Gold sulphate
D Potassium aurocyanide

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