The chemical formula of othophosphoric acid is
A.H3PO3
B.H3PO4
C.H4P2O7
D.HPO3
Category: Fertilizer Technology Mcqs
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
Which of the following properties of white phosphorus are common to red phosphorus?
A.It is soluble in carbon disulphide
B.It phosphoresces in air
C.It reacts with hot caustic soda solution to give phosphine
D.It burns when heated in air
For given pressure temperature and total feed rate urea yield
A.increases with increase in NH3/CO2 ratio
B.decreases with increase in NH3/CO2 ratio
C.remains unaffected with change in NH3/CO2 ratio
D.may increase decrease remains unaffected with change in NH3/CO2 ratio
