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(A) In the industrial production of phosphorus,calcined phosphate rock (calcium phosphate) is heated with coke and sand in an electric furnace at $177

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Phosphorus

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(A) In the industrial production of phosphorus,calcined phosphate rock (calcium phosphate) is heated with coke and sand in an electric furnace at $1773 \ K$. The chemical reaction is: $2Ca_3(PO_4)_2 + 6SiO_2 + 10C \rightarrow 6CaSiO_3 + 10CO + P_4$. Here,$P_4$ (white phosphorus) is the main product,while $CaSiO_3$ (calcium silicate) is formed as a slag. Among the given options,phosphorus is the correct product.

List-$I$ Name of oxo acid	List-$II$ Oxidation state of $P$
$(a)$ Hypophosphorous acid	$(i) +5$
$(b)$ Orthophosphoric acid	$(ii) +4$
$(c)$ Hypophosphoric acid	$(iii) +3$
$(d)$ Orthophosphorous acid	$(iv) +2$
	$(v) +1$

Which of the following is one of the products obtained when calcined phosphate rock is reduced with coke and sand in an electric furnace at $1773 \ K$?

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