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

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Q. Commercial fertilisers are available mostly in the form of

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Q. Pick out the wrong statement.

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Q. Ammonia synthesis gas is produced from natural gas by

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Q. P₂O₅ content in triple superphosphate is about __________ percent.

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Q. H₃PO₄ is the chemical formula of __________ phosphoric acid.

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Q. Heating of orthophosphoric acid to 250°C produces

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Q. Vapor phase reaction of ammonia & nitric acid to produce ammonium nitrate is termed as the __________ process.

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Q. Use of catalyst is a must in the ammonia manufacture, because the reaction is reversible as well as the heat of dissociation of N₂ & H₂ is high. The presence of promoter along with the catalyst helps in __________ of the catalyst.

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Q. The concentration (weight %) of nitric acid produced by the oxidation of ammonia and absorption of nitrogen oxides with water is about __________ percent.

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Q. Urea is a __________ fertiliser.

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Q. Calcium ammonium nitrate (CAN) is

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Q. CO₂ present in reformed gas (obtained by steam reforming of naphtha) is removed by absorbing in

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Q. Which is the most suitable fertiliser for paddy ?

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Q. During conversion of ammonium carbamate into urea, presence of large excess of water

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Q. Hydrogen content of coke oven gas is __________ percent.

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Q. Pick out the wrong statement.

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Q. Ammonium nitrate (a fertiliser) is coated with limestone powder to

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Q. Action of phosphoric acid on rock phosphate produces

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Q. Catalyst used in the manufacture of NH₃ by Haber's process is finely divided

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