Metaphosphoric acid can be made by heating the orthophosphoric acid to about
A.250?C
B.500?C
C.900?C
D.1500?C
Category: Fertilizer Technology Mcqs
Phosphatic fertilizer is graded based on its
A.P2O5 content
B.P content
C.PCI3 content
D.H3PO4 content
The operating temperature and pressure in urea autoclave are
A.550?C and 1000 atm respectively
B.100?C and 1000 atm respectively
C.185?C and 180 atm respectively
D.25?C and 1 atm respectively
In the manufacture of urea from ammonia and carbon dioxide
A.aluminium oxide is used as catalyst
B.platinum is used as catalyst
C.silica-alumina mixture is used as catalyst
D.no catalyst is required
If the reactor temperature is wet process (strong sulphuric acid leaching) for the manufacture of orthophosphoric acid is kept about 100?C
A.undesirable CaSO4.
B.pyrophosphoric acid is formed
C.metaphosphoric acid is formed
D.none of these answers
Ammonium nitrate is manufactured by
A.the oxidation of ammnia
B.reacting liquid ammonia and 60% nitric acid
C.the oxidation of 60% nitric acid
D.reacting liquid ammonia and 98% sulphuric acid
The chemical formula of metaphosphoric acid is
A.H4P2O7
B.HPO3
C.H3PO3
D.H3PO4
The chemical formula of urea is
A.NH4.COO.NH2
B.NH2.CO.NH2
C.NH3.CO2.NH3
D.NH2.CO.NH.CO.NH2
Orthophosphoric acid forms
A.H3PO4.H2O in water solutions
B.(H3PO4)2.H2O in water solutions
C.(H3PO4)4.H2O in water solutions
D.(H3PO4)3.H2O in water solutions
Urea is a
A.nitrogenous fertilizer
B.Phosphatic fertilizer
C.potassic fertilizer
D.mixed fertilizer
