In which of the following production processe | vedclass

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(A) $1$. In the production of phosphorus from phosphorite $(Ca_3(PO_4)_2)$,silica $(SiO_2)$ and coke are used,not limestone.$2$. In the manufacture of

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Phosphorus from phosphorite

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(A) $1$. In the production of phosphorus from phosphorite $(Ca_3(PO_4)_2)$,silica $(SiO_2)$ and coke are used,not limestone.$2$. In the manufacture of Portland cement,limestone is a primary raw material.$3$. In the extraction of iron from hematite $(Fe_2O_3)$ in a blast furnace,limestone is used as a flux to remove silica impurities.$4$. In the Solvay process for the production of sodium carbonate $(Na_2CO_3)$,limestone is heated to provide both $CO_2$ and $CaO$.

In which of the following production processes is limestone $(CaCO_3)$ $NOT$ used?

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