Related Questions

Fusion zone in the electric furnace used for reduction of phosphate rock to elemental phosphorous is maintained at __________ °C.
A 250-300
B 500-750
C 950-1050
D 1400-1450
A tea merchant blends 2 kinds of tea, putting in 3 parts of a Tk. 25 per kg grade to 1 part of a Tk. 15 per kg. If the mixture is changed to 1 part of the Tk. 25 per kg grade to 3 parts of the less expensive grade, how much will the shop lose or save in blending 200 kg?
A lose Tk. 500
B loss Tk. 1,000
C save Tk. 1,500
D save Tk. 1,000
Electric furnace method for production of phosphorous uses phosphate rock
A And phosphoric acid
B And coke
C And sulphuric acid
D Silica and coke
Heating a mixture of phosphate rock, coke and sand in an electric furnace produces
A Phosphoric acid
B Ammonium phosphate
C Phosphorous
D Superphosphate
A mixture of phosphate rock __________ is heated in an electric furnace to produce phosphorous.
A Salt & coke
B Sand & coke
C And coke
D And sand
Because of its very high refractoriness of the order of __________ °C, silicon carbide refractories are used in zinc smelting furnace, muffle furnace and for supporting the wares in tunnel kilns.
A 1800
B 2200
C 2400
D 2700
Rock phosphate used for the production of phosphatic fertiliser is mined at
A Amjhor (Jharkhand)
B Talchar (Orissa)
C Bailladella (M.P.)
D Kiriburu (Bihar)
__________ content of the phosphate rock is the pollutant of primary interest in a phos-phatic fertiliser plant.
A Calcium
B Fluorine
C Phosphorous
D Sulphur
Leaching of phosphate rock by strong __________ acid produces phosphoric acid.
A Sulphuric
B Hydrochloric
C Either A or B
D Neither A nor B
Triple superphosphate is made by reacting phosphate rock with __________ acid.
A Phosphoric
B Nitric
C Sulphuric
D Hydrochloric

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