Conversion of yellow phosphorous to red phosphorous is done by heating it in covered retorts at __________ °C in absence of air. 1000-1200 250-400 800-900 50-80 TRUE ANSWER : ? YOUR ANSWER : ?
Which of the following does not come under the category of 'secondary nutrient' for plant growth? Magnesium Sulphur Oxygen Calcium TRUE ANSWER : ? YOUR ANSWER : ?
In __________ converter for ammonia synthesis, the catalyst is arranged in the form of a single continuous bed. Claude Fauser-Monte Catini Kellog Udhe TRUE ANSWER : ? YOUR ANSWER : ?
Main constituent of phosphate rock is Ammonium phosphate Calcium fluoride Calcium phosphate Flour apatite TRUE ANSWER : ? YOUR ANSWER : ?
Yield of elemental phosphorous from rock phosphate is about __________ percent. 60-65 1-2 15-25 40-45 TRUE ANSWER : ? YOUR ANSWER : ?
Which one of the following is used as a nitrogenous fertiliser, as a weed killer in the onion fields and for correcting acidic soils? Ammonium sulphate CAN Urea Calcium cyanamide TRUE ANSWER : ? YOUR ANSWER : ?
Dehydration of ammonium carbamate produces Biuret Ammonia water Urea None of these TRUE ANSWER : ? YOUR ANSWER : ?
5-10-5 fertilisers mean that they contain Only 5 to 10% active fertiliser constituents None of these 5, 10, 5% respectively of N₂, P₂O₅ and K₂O 5 to 10% filler & carrier of soil conditioners TRUE ANSWER : ? YOUR ANSWER : ?
Heating of orthophosphoric acid to about 900°C, produces Metaphosphoric acid No change in it None of these Pyrophosphoric acid TRUE ANSWER : ? YOUR ANSWER : ?
In the manufacture of H₃ PO₄ (ortho), ; strong H₂ SO₄ leaching wet process as compared to electric furnace process Produces lower purity acid Uses lower grade phosphate rock Is very costly Requires lower capital investment in the plant TRUE ANSWER : ? YOUR ANSWER : ?