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Fertiliser Technology

Fertiliser Technology
Yield of elemental phosphorous from rock phosphate is about __________ percent.

60-65
15-25
1-2
40-45

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Fertiliser Technology
Reaction of phosphate rock with 98% H₂SO₄ produces

Orthophosphoric acid
None of these
Superphosphate
White phosphorous

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Fertiliser Technology
Bio-fertilisers are cheaper, renewable and pollution free. They improve the __________ of the soil.

Texture
Water holding capacity
All of these
Nutrient supply

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Fertiliser Technology
Electric process as compared to wet process (for the manufacture of phosphoric acid)

Is used less frequently
Produces a valuable by-product called gypsum
Can use only high grade phosphate rock
Is weak acid process

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Fertiliser Technology
Maximum stability of white phosphorous is at

>600°C
Very high pressure
Atmospheric pressure
Room temperature

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Fertiliser Technology
Liquid ammonia and 60% nitric acid reaction (which produces ammonium nitrate) is

Endothermic
Exothermic
Autocatalytic
None of these

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