Conversion of yellow phosphorous to red phosphorous is done by heating it in covered retorts at ____________ °C in absence of air?

Related Mcqs:

-10-5 fertilisers mean that they contain______________?

A. 5, 10, 5% respectively of N2, P2O5 and K2O B. Only 5 to 10% active fertiliser constituents C. 5 to 10% filler & carrier of soil conditioners D. None of these...

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?

A. Coke oven B. Producer C. Natural D. Coal...

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

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

H3PO4 is the chemical formula of ______________ phosphoric acid?

A. Pyro B. Ortho C. Meta D. None of these...

Heating a mixture of phosphate rock, coke and sand in an electric furnace produces___________________?

A. Phosphoric acid B. Ammonium phosphate C. Phosphorous D. Superphosphate...