In wet process (strong sulphuric acid leaching) for the manufacture of orthophosphoric acid the reactor temperature is maintained at
A.80?C
B.200?C
C.250?C
D.900?C
Category: Fertilizer Technology Mcqs
Pyrophosphoric acid can be made by heating the orthophosphoric acid to
A.100?C
B.250?C
C.900?C
D.1400?C
The chemical formula of othophosphoric acid is
A.H3PO3
B.H3PO4
C.H4P2O7
D.HPO3
Phosporus is manufactured by heating in electric furnace a mixture of
A.phosphate rock and coke
B.phosphate rock and sand
C.phosphate rock coke and sand
D.phosphate rock coke and common salt
When calcium carbide is heated with nitrogen the product obtained is
A.Ca3N2
B.Ca(CN)2
C.CaCN2
D.Ca(CNO)2
Potassic fertilizer is graded based on its
A.K2O content
B.KOH content
C.KNO3 content
D.K content
Which of the following process is used for the commercial production of nitric acid?
A.NaNO3 + H2SO4 process
B.Ammonia oxidationin process
C.Passing air through an electric are
D.None of these answers
Mixed fertilizers contain three principal elements (nitrogen phosphorus and potassium). 5-10-5 mixed fertilizer contains
A.5 wt. % P2O5 10%N 5% K2O
B.5 wt. % N 10% P2O5 5% K2O
C.5 wt. % N 10% P2O5 85% K2O
D.10 wt. % N 10% P2O5 5% K2O
The chemical formula of sodium tripolyphosphate (STPP) is
A.Na5P3O10
B.Na3P5O10
C.Na3P3O10
D.Na5P2O5
The nitrogen content is minimum in
A.ammonium sulphate
B.nitrolime
C.ammonium chloride
D.ammonium nitrate
