Related Questions

Leaching of phosphate rock by strong __________ acid produces phosphoric acid.
A Sulphuric
B Hydrochloric
C Either A or B
D Neither A nor B
Sulphuric acid is mixed with ground phosphate rock (to produce phosphoric acid) in a steel digestor lined with
A Acidic refractory
B Rubber
C Karbate
D Lead or acid-proof bricks
Action of phosphoric acid on rock phosphate produces
A Superphosphate
B Triple superphosphate
C Nitrophosphate
D Diammonium phosphate
Electric process as compared to wet process (for the manufacture of phosphoric acid)
A Can use only high grade phosphate rock
B Is used less frequently
C Produces a valuable by-product called gypsum
D Is weak acid process
Sodium tri poly phosphate (STPP) is manufactured by reaction of phosphoric acid with sodium
A Carbonate
B Phosphate
C Bicarbonate
D Silicate
Reaction of nitric acid and sulphuric acid with phosphate rock produces
A Nitrophosphate
B Diammonium phosphate
C Tricresyl phosphate
D Tributyl phosphate
The wet bulb temperature is lower in dry air than in wet air at the same temperature. A dry bulb thermometer registers a higher temperature than a wet bulb thermometer except at __________ percent relative humidity.
A 0
B 100
C 50
D None of these
Triple superphosphate is made by reacting phosphate rock with __________ acid.
A Phosphoric
B Nitric
C Sulphuric
D Hydrochloric
Reaction of dilute sulphuric acid with phosphate rock produces
A Phosphoric acid
B Superphosphate
C Triple superphosphate
D Gypsum
Reaction of orthophosphoric acid with phosphate rock produces
A Superphosphate
B Triple superphosphate
C Metaphosphoric acid
D Monoammonium phosphate

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