Fertiliser Technology

191.Which of the following is the costliest method for commercial production of hydrogen for ammonia synthesis?

1. H₂ separation from coke oven gas
2. Steam reforming of naphtha
3. Cracking of natural gas
4. Electrolysis of water

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

1. Electrolysis of water
2. Cryogenic removal of H₂ from coke oven gas
3. Steam reforming of naphtha
4. Natural gas cracking

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193.Which of the following nitrogenous fertilisers has the highest percentage of nitrogen?

1. Calcium nitrate
2. Calcium ammonium nitrate (CAN)
3. Urea
4. Ammonium sulphate

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

1. High pressure, low reactants concentration, high temperature
2. High pressure, low reactants concentration, low temperature
3. High pressure, high reactants concentration, low temperature
4. Low pressure, high reactants concentration, low temperature

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195.Which of the following solvents is used for the extraction of H3PO₄ from CaCl2 solution during manufacture of ortho-phosphoric acid by wet process employing hydrochloric acid leaching?

1. Isopropyl alcohol
2. Butyl alcohol
3. Toluene
4. Hexane

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196.Which one of the following is used as a nitrogenous fertiliser, as a weed killer in the onion fields and for correcting acidic soils?

1. Urea
2. CAN
3. Ammonium sulphate
4. Calcium cyanamide

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197.With increases in pressure, the conversion of Ammonium carbamate into urea

1. Increases
2. Decreases
3. Remains unaltered
4. Can either increase or decrease depends on biuret content

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198.Yield of elemental phosphorous from rock phosphate is about _________ percent.

1. 43862
2. 15-25
3. 40-45
4. 60-65

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199.Yield of urea can be increased with excess ammonia and higher pressure&temperature, but because of _________ this is normally not done.

1. Increased biuret formation
2. High corrosion rate
3. Increased cost of equipment
4. All (A), (B)&(C)

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