A. Yellow phosphorous which is the most reactive allotropic form of phosphorous is transported
under water
B. Apatite is the principal material present in phosphate rock which is chemically Ca10 (PO4)6 (F,
Cl, OH)
C. Urea is more hygroscopic than ammonium nitrate
D. Nitrogen fixation means the process of bringing atmospheric nitrogen into combination i.e.
into nitrogen compound form

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