Sodium tripolyphosphate (STPP) is made by reacting orthophosphoric acid with
A.limestone
B.quick lime
C.slaked lime
D.soda ash
Category: Fertilizer Technology Mcqs
Raw materials for the manufacture of ammonium nitrate are
A.liquid ammonia and air
B.liquid ammonia 60% nitric acid and clay (diatomaceous earth kieselgur)
C.anhydrous ammonia and nitrous acid
D.liquid ammonia and 98% sulphuric acid
Which one of the following substances is used as a nitrogenous fertilizer as a weed killer in the onion fields and for correcting acidic soils?
A.Urea
B.Basic slag
C.Superphosphate of lime
D.Calcium cyanamide
The electric furnace is used for the manufacture of elemental phosphorus from phosphate rock. The electrodes are made of
A.carbon
B.aluminium
C.zinc
D.copper
Sodium tripolyphosphate (STPP) is mainly used
A.in detergents formulation
B.in machine industries
C.as fertilizer
D.in plastics and coatings
Excessive application of synthetic fertilizers often causes shrivelling of the roots and wilting of the plant. This is because
A.the soil becomes too acidic
B.the soil becomes too alkaline
C.the osmotic pressure of the soil water becomes higher than that of the plant sap
D.the osmotic pressure of the soil water becomes less than that of the plant sap
Which of the following allotropic forms of phosphorus is used in the manufacture of safety matches?
A.White phosphorus
B.Red phosphorus
C.Black phosphorus
D.all forms of phosphorus
The catalyst used in the manufacture of nitric acid by ammonia oxidation process is
A.Ni
B.Fe
C.V2O5
D.Pt-Rh alloy
Yellow phosphorus is converted to red phosphorus in covered retorts at a temperature of
A.250-450?C in absence of air
B.100-150?C in absence of air
C.1400-1450?C in absence of air
D.800-1000?C in absence of air
Nitrolime is used as nitrogenous fertilizer. Its composition is
A.Ca3N2
B.Ca(CN)2
C.CaCN2
D.CaCN2 + C
