Red phosphorus is chemically unreactive because
A.it does not contain P-P bonds
B.it does not contain tetrahedral P4 molecules
C.it does not catch fire in air even upto 200?C
D.it has a polymeric structure
Category: Fertilizer Technology Mcqs
The phosphorus vapours are composed of
A.P
B.P2
C.P3
D.P4
All NH3 synthesis catalysts are based on iron oxide promoted by
A.SiO2
B.K2O (1-2%)
C.ZnO
D.V2O5
The concentration of the nitric acid produced by the oxidation of ammonia and absorption of nitrogen oxides with water is about
A.95 wt. %
B.57-60 wt. %
C.100 wt. %
D.75 wt. %
Raw materials for the manufacture of orthophosphoric acid by wet process are phosphate rock and
A.coke
B.98% H2SO4
C.sand
D.60% HNO3
White phosphorus is most stable
A.at ordinary temperature
B.at atmospheric pressure
C.above 600?C
D.under high pressure
The chemical formula of diammonium phosphate is
A.(NH4)2HPO4
B.(NH4)2H2PO4
C.NH4H2PO4
D.(NH4)2PO4
Phosphatic fertilizer is required
A.during early stages of plant growth to promote development of stems and leaves
B.to stimulate early growth and accelerate seeding or fruit formation in later stages of growth
C.for the development of the starches of potatoes and grains
D.for the development of the sugar of fruits and vegetables and the fibrous material of plants
Urea is formed in a low-pressure stripping operation by dehydration of
A.ammonium bicarbonate
B.ammonium carbomate
C.biuret
D.ammonium nitrate
Triple superphosphate is made by reacting phosphate rock with orthophosphoric acid. It is represented by
A.CaH4(PO4)2
B.CaH2(PO4)2
C.Ca3H4(PO4)2
D.Ca3(PO4)2
