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Fertiliser Technology

Fertiliser Technology
Electric furnace method for production of phosphorous uses phosphate rock

And phosphoric acid
And sulphuric acid
And coke
Silica and coke

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Fertiliser Technology
Yield of urea can be increased with excess ammonia and higher pressure & temperature, but because of __________ this is normally not done.

Increased cost of equipment
Increased biuret formation
High corrosion rate
All of these

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

500-750
950-1050
250-300
1400-1450

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Fertiliser Technology
Conversion of yellow phosphorous to red phosphorous is done by heating it in covered retorts at __________ °C in absence of air.

800-900
250-400
1000-1200
50-80

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Fertiliser Technology
Reaction of dilute sulphuric acid with phosphate rock produces

Superphosphate
Triple superphosphate
Phosphoric acid
Gypsum

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Fertiliser Technology
pH value of soil is maintained at __________ by the addition of fertiliser for optimum growth and health of the plant.

43926
44084
44178
44020

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