Q. Which of the following fertilisers is used as a cattle feed?

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Q. Biuret formation in urea is kept at minimum (< 1 %), because it is

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Q. Catalyst used in desulphurisation of naphtha is

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Q. Pick out the correct statement.

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Q. Though liquid ammonia itself is a fertiliser (with 82% nitrogen content) yet it is commonly not used as such in a tropical country like India, because it

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Q. Rock phosphate used for the production of phosphatic fertiliser is mined at

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Q. CaH₄(PO₄)₂ is the chemical formula of

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Q. Nitro-phosphate (manufactured at Trom-bay) is a __________ fertiliser.

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Q. Conversion of yellow phosphorus to red phosphorous is done in retorts at 250-450°C in the

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Q. A phosphatic fertiliser contains 16% P₂O₅. It could be

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Q. __________ is not a fertiliser.

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Q. __________ is the undesirable by-product produced in the manufacture of urea.

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

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Q. Which is the best fertiliser for paddy ?

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Q. Main constituent of phosphate rock is

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Q. Which of the following is the costliest source of hydrogen needed for ammonia manufacture under Indian condition ?

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Q. Formation of ammonium carbamate by reaction of NH₃ with CO₂ is a/an __________ reaction.

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

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Q. A potassic fertiliser contains 50% K₂O. It could be

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Q. Leaching of phosphate rock by strong __________ acid produces phosphoric acid.

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