Related Questions

For making fly-ash building bricks, the following mix of fly-ash, sand and lime, is
A 80 : 13 : 7
B 70 : 20 : 10
C 60 : 35 : 5
D None of these
The popular notion that a tree's age can be determined by counting number of internal rings in its trunk is generally true. Howeevr, to help regulate the internal temperature of the tree, the outermost layers of wood of the Brazilian ash often →peel away when the temperature exceeds 95 degrees Fahrenheit, leaving the tree with fewer rings than it would otherwise have. So only if the temperature in the Brazilian ash's environment never exceeds 95 degrees Fahrenheit →elav eing the tree with fewer rings than it would otherwise have. So only if the reliable measure of the tree's age. Which of the following is an assumption on whish the argument above depends?
A The growth of new rings in a trees is not a function of levels of precipitation.
B Only the Brazilaian ash loses rings because of excessive heat.
C One day of temperatures above 95 degrees Fahrenheit will cause the Brazilian ash to lose one ring.
D The internal rings of all tress are of uniform thickness
The major disadvantage of lime soda process of water softening is that
A It is unsuitable for turbid and acidic water
B Huge amount of precipitate is formed which creates a disposal problem
C The effluent cannot be reduced to zero hardness
D It is unsuitable for softening the water of excessive hardness
__________ is removed from water by lime-soda process.
A Foul smell and taste
B Iron and manganese
C Temporary hardness
D Permanent hardness
Commercial production of soda ash by Solvay process requires limestone, __________ as raw materials.
A Coke and sand
B Brine and coal
C Coke and caustic soda
D None of these
Dense soda ash used in the manufacture of glass, is chemically represented by
A Na2CO3
B Na2CO3.10H2O
C Na2CO3.H2O
D Na2HCO3
Reaction of orthophosphoric acid with soda ash produces
A Sodium tripolyphosphate (STPP)
B Tricresyl phosphate
C Tributyl phosphate
D Nitrophosphate
Sodium bicarbonate is produced during soda ash manufacture using a __________ tower.
A Plate
B Baffle
C Packed
D None of these
Raw materials for 'Solvay Process' for manufacture of the soda ash are
A Salt, limestone and coke or gas
B Ammonia, salt and limestone
C Ammonia limestone and coke
D None of these
Chemical name of soda ash is
A Sodium bicarbonate
B Sodium thiosulphate
C Potassium carbonate
D None of these

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