Question

The elemental phosphorus is made from rock phosphate,   3 4 2 Ca PO by making use of which one of the following reactions ? 1)Ca3 PO4 2 C MgO 2)   3 4 2 2 Ca PO C  SiO  3)   3 4 2 Ca PO  C  ZnO 4)   3 4 2 Ca PO C  FeO

Answer 1

Explanation:

Phosphorus is a chemical element with the symbol P and atomic number 15. Elemental phosphorus exists in two major forms, white phosphorus and red phosphorus, but because it is highly reactive, phosphorus is never found as a free element on Earth. It has a concentration in the Earth's crust of about one gram per kilogram (compare copper at about 0.06 grams). In minerals, phosphorus generally occurs as phosphate.

Elemental phosphorus was first isolated as white phosphorus in 1669. White phosphorus emits a faint glow when exposed to oxygen – hence the name, taken from Greek mythology, Φωσφόρος meaning "light-bearer" (Latin Lucifer), referring to the "Morning Star", the planet Venus. The term "phosphorescence", meaning glow after illumination, derives from this property of phosphorus, although the word has since been used for a diverse physical process that produces a glow. The glow of phosphorus is caused by oxidation of the white (but not red) phosphorus — a process now called chemiluminescence. Together with nitrogen, arsenic, antimony, and bismuth, phosphorus is classified as a pnictogen.

Answer 2

The elemental phosphorus is made from rock phosphate by the use of the following reaction:

(2) 2 Ca3(PO4)2 (s) + 10 C (s) + 6 SiO2 (s)  → P4 (s) + 6 CaSiO3 (s) + 10 CO (g)

- The element phosphorous exists in elemental form as P4.

- It is converted from Ca3(PO4)2 to P4 by the use of carbon and silicon dioxide as per the balanced reaction given above.