Temperature and pressure in urea autoclave is_________________?
(A) 120°C and 300 atm
(B) 190°C and 200 atm
(C) 400°C and 550 atm
(D) 200°C and 10 atm
_____________ is the undesirable by-product produced in the manufacture of urea ?
(A) Ammonium carbonate
(B) Biuret
(C) Carbon dioxide
(D) Ammonium carbamate
A Potassic fertiliser contains 50% K2O. It could be _________________?
(A) Potassium sulphate
(B) Potassium chloride
(C) A mixture of NaCl + KCl
(D) None of these
Prilling of urea should be accomplished (in a sprayer) just above the melting point of urea with minimum of retention time, otherwise it will result in__________________?
(A) Low bulk density product
(B) Biuret formation
(C) Non-spherical prills
(D) Substantially wet non-flowing and sticky product
Which nutrient in fertiliser makes the plant stems stronger and increases branching ?
(A) Nitrogen
(B) Phosphorous
(C) Potassium
(D) Calcium
Conversion of yellow phosphorus to red phosphorous is done in retorts at 250-450°C in the ___________________?
(A) Presence of an inert atmosphere
(B) Presence of a reducing atmosphere
(C) Absence of air
(D) Presence of an oxidising atmosphere
In natural gas, the C/H ratio (by weight) varies in the range of_________________?
(A) 3-4
(B) 8-10
(C) 15-17
(D) 20-25
Ammonium phosphate is a _____________ fertiliser?
(A) Nitrogenous
(B) Phosphatic
(C) Complex
(D) Mixed
Nitrolime is chemically known as____________________?
(A) Calcium nitrate
(B) Ammonium nitrate
(C) Calcium ammonium nitrate (CAN)
(D) None of these
H3PO4 is the chemical formula of ______________ phosphoric acid?
(A) Pyro
(B) Ortho
(C) Meta
(D) None of these