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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Q. In natural gas, the C/H ratio (by weight) varies in the range of

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Q. Which of the following fertilisers is needed for promoting the development of leaves and stems during early stages of plant growth ?

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Q. Which of the following set of conditions is favourable for the maximum yield of ammonia by Haber's process ?

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Q. Prilling of urea should be accomplished (in a sprayer) just above the melting point of urea with minimum of retention time, otherwise it will result in

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Q. A mixture of phosphate rock __________ is heated in an electric furnace to produce phosphorous.

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Q. An increase in the NH₃/CO₂ ratio in urea manufacture results in

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Q. A fertiliser plant is classified as a gas based fertiliser plant, when it uses __________ gas as a source of hydrogen for the manufacture of ammonia.

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Q. Fertilizer plant getting its hydrogen requirement partly from coke oven gas is situated at

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