161. Catalyst used in desulphurisation of naphtha is
Co-Mo
Pt-Rh
Silica gel
Nickel
✅ The correct answer is option A.
Fertilizer Technology MCQs
162. Nitrogen content in ammonium sulphate (a fertiliser) is around __________ percent.
5
20
50
65
✅ The correct answer is option B.
163. Dehydration of ammonium carbamate (to produce urea) is a/an __________ reaction.
Reversible
Catalytic
Exothermic
Endothermic
✅ The correct answer is option D.
164. Which of the following fertilisers contains the least percentage of nitrogen?
Liquid ammonia
Urea
Ammonium phosphate
Ammonium sulphate
✅ The correct answer is option C.
165. Iron is not used alone as a catalyst in ammonia synthesis, because
Its activity declines rapidly, if heated to above 520°C
It decomposes ammonia
It gets oxidised above 500°C
None of these
✅ The correct answer is option A.
166. Reaction of anhydrous liquid ammonia with orthophosphoric acid produces
Ammonium phosphate
Superphosphate
Triple superphosphate
None of these
✅ The correct answer is option A.
167. Catalyst used in Haber’s process for ammonia production is
Reduced iron oxide
Nickel
Vanadium pentoxide
Silica gel
✅ The correct answer is option A.
168. Yield of urea can be increased with excess ammonia and higher pressure & temperature, but because of __________ this is normally not done.
Increased biuret formation
High corrosion rate
Increased cost of equipment
All of the above
✅ The correct answer is option D.
169. Gas based fertiliser plants use
Natural gas as a source of hydrogen
Natural gas as heating medium
Coal gas as a source of hydrogen
Coal gas as heating medium
✅ The correct answer is option A.
170. Conversion achieved in HNO₃ synthesis with the use of platinum catalyst is about 95-97%. The rate of formation of nitrogen dioxide from the oxidation of nitric acid is favoured by
Decreasing the pressure
Decreasing the temperature
Increasing the temperature
None of these
✅ The correct answer is option C.