Free Chemical Process Principles MCQs with Answers

• A. Nature of soil
• B. Type of crop
• C. pH of soil
• D. None of these

Explanation: Fertiliser performance depends on soil properties, crop requirements, and soil pH because these affect nutrient availability and uptake.

• A. Nitro-phosphate
• B. Ammonium sulphate
• C. Superphosphate
• D. Potassium nitrate

Explanation: Ammonium sulphate is traditionally considered suitable for paddy because it supplies readily available ammoniacal nitrogen and sulphur…

• A. Superphosphate
• B. Nitrophosphate
• C. Triple superphosphate
• D. Diammonium phosphate

Explanation: Phosphoric acid reacts with rock phosphate to produce triple superphosphate, which has a high concentration of water-soluble phosphate.

• A. None of these
• B. Ammoniacal nitrogen is quick acting
• C. Nitrate nitrogen is slower acting
• D. Nitrate nitrogen is quick acting

Explanation: Nitrate nitrogen is immediately available to plants, whereas ammoniacal nitrogen generally acts more slowly because it may first undergo…

• A. Oxygen
• B. Magnesium
• C. Sulphur
• D. Calcium

Explanation: Calcium, magnesium, and sulphur are the three secondary plant nutrients.

• A. Calcium ammonium nitrate
• B. Urea
• C. Superphosphate
• D. Ammonium sulphate

Explanation: Urea supplies readily available nitrogen and is also used as a non-protein nitrogen source in cattle feed, where rumen microbes convert it…

• A. 4
• B. 22
• C. 58
• D. 84

Explanation: Coke-oven gas typically contains about 50 to 60% hydrogen, with methane, carbon monoxide and other gases making up most of the remainder.

• A. Nitrogenous fertiliser
• B. Potassic fertiliser
• C. Phosphatic fertiliser
• D. None of these

Explanation: Nitrogen promotes vegetative growth, especially the formation of leaves and stems during the early growth period.

• A. The best fertiliser for paddy
• B. The highest concentration nitrogenous fertiliser
• C. A basic fertiliser
• D. A neutral fertiliser

Explanation: Ammonium sulphate is widely regarded as a suitable fertiliser for paddy because it supplies nitrogen and sulphur and performs well in…

• A. Nitric acid
• B. Ammonia
• C. Ammonium nitrate
• D. Nitric oxide

Explanation: Urea is manufactured by reacting ammonia with carbon dioxide to form ammonium carbamate, which then dehydrates to urea.

• A. Gujarat and Madhya Pradesh
• B. Maharashtra and Orissa
• C. Maharashtra and Gujarat
• D. Jharkhand and Chhattisgarh

Explanation: The commonly cited gas-based fertiliser plants in this question are associated with Maharashtra and Gujarat, where natural-gas…

• A. 1-2
• B. 60-65
• C. 40-45
• D. 15-25

Explanation: In the electric-furnace process, only a fraction of the phosphorus in rock phosphate is recovered as elemental phosphorus, with typical…

• A. 15-20
• B. 42-50
• C. 85-90
• D. 70-75

Explanation: Triple superphosphate is a concentrated phosphate fertiliser containing roughly 42 to 50% available P2O5.

• A. NH.CO2.NH
• B. NH3CO.CH3
• C. NH2.CO.NH2
• D. NH3.CO2.NH3

Explanation: Urea has two amino groups attached to a carbonyl group, giving the structural formula CO(NH2)2, written here as NH2.CO.NH2.

• A. Tributyl phosphate
• B. Diammonium phosphate
• C. Tricresyl phosphate
• D. Nitrophosphate

Explanation: Nitric-acid digestion of phosphate rock, often with sulphuric acid in the process, produces nitrophosphate fertilizers.

• A. Vaporisation followed by condensation
• B. Melting under pressure
• C. Heating in presence of light
• D. None of these

Explanation: Red phosphorus is first vaporised at high temperature and then condensed to form the white allotrope.

• A. Calcium ammonium nitrate
• B. Urea
• C. Triple superphosphate
• D. None of these

Explanation: The Montecatini process is an ammonia-carbon dioxide process for manufacturing urea, involving ammonium carbamate formation followed by…

• A. 10
• B. 25
• C. 50
• D. 80

Explanation: Calcium ammonium nitrate commonly contains about 25 to 28% nitrogen, with 25% being the standard value among these choices.

• A. Carbon
• B. Phosphorous
• C. Potassium
• D. Nitrogen

Explanation: Nitrogen promotes vegetative growth and chlorophyll formation, so leafy crops require relatively high nitrogen supply.

• A. Liquid NH3
• B. Urea
• C. Ammonium nitrate
• D. None of these

Explanation: Liquid ammonia contains about 82.3% nitrogen by mass, matching the stated composition.