Fertiliser Technology

71.Formation of ammonium carbamate by reaction of NH₃ with CO₂ is a/an _________ reaction.

1. Catalytic
2. Exothermic
3. Endothermic
4. Reversible

View answer

72.Fusion zone in the electric furnace used for reduction of phosphate rock to elemental phosphorous is maintained at _________ °C.

1. 250-300
2. 500-750
3. 950-1050
4. 1400-1450

View answer

73.Gas based fertiliser plants use

1. Natural gas as a source of hydrogen
2. Natural gas as heating medium
3. Coal gas as a source of hydrogen
4. Coal gas as heating medium

View answer

74.H₃PO₄ is the chemical formula of _________ phosphoric acid.

1. Pyro
2. Ortho
3. Meta
4. None of these

View answer

75.H₄P₂O7 is the chemical formula of _________ phosphoric acid.

1. Pyro
2. Ortho
3. Meta
4. None of these

View answer

76.Heating a mixture of phosphate rock, coke and sand in an electric furnace produces

1. Phosphoric acid
2. Ammonium phosphate
3. Phosphorous
4. Superphosphate

View answer

77.Heating of coke, sand&phosphate rock in an electric furnace is done for the manufacture of

1. Phosphoric acid
2. Superphosphate
3. Phosphorous
4. Triple superphosphate

View answer

78.Heating of ortho-phosphoric acid to about 900°C, produces

1. Meta-phosphoric acid
2. Pyrophosphoric acid
3. No change in it
4. None of these

View answer

79.HPO₃ is the chemical formula of _________ phosphoric acid.

1. Pyro
2. Ortho
3. Meta
4. None of these

View answer

80.Hydrogen content of coke oven gas is _________ percent.

1. 4
2. 22
3. 58
4. 84

View answer