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Fertiliser Technology

Fertiliser Technology
Heating of orthophosphoric acid to about 900°C, produces

Metaphosphoric acid
Pyrophosphoric acid
None of these
No change in it

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Fertiliser Technology
Triple superphosphate is chemically represented as

CaF₂.3Ca₃(PO₄)₂
Ca(H₂PO₄)₂
Ca(PO₃)₂
3Ca₃(PO₄)₂

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Fertiliser Technology
During nitric acid manufacture, catalytic oxidation of ammonia at 800°C in presence of platinum catalyst produces nitrogen oxide. Conversion of NH₃ to NO is about __________ percent.

98
68
38
82

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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
250-300
950-1050
1400-1450

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Fertiliser Technology
In ammonia synthesis (N₂ + 3H₂ = 2NH₃), there is a decrease in total volume, hence to get high equilibrium conversion, the reaction should be carried out at

High pressure
Low pressure
Very high temperature
Atmospheric pressure; as the pressure has no effect on conversion

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Fertiliser Technology
Heating of orthophosphoric acid to 250°C produces

Metaphosphoric acid
No change in it
Pyrophosphoric acid
None of these

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