Limestone is not used in which of the following manufacturing processes?
Correct answer: A. Phosphorus from phosphorite
- A. Phosphorus from phosphorite
- B. Ordinary(soda lime) glass
- C. Iron from hematite
- D. Solvay process of sodium carbonate
Explanation
The primary method for extracting phosphorus from phosphorite (Ca3(PO4)2) is carbothermal reduction, which uses coke (carbon) as the reducing agent but doesn't involve limestone. The reaction proceeds as follows:2Ca3(PO4)2 + 5C + 2SiO2 → 3CaSiO3 + P4 + 5CO2
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About s-Block and p-Block Elements
The s and p blocks are studied through their valence-shell configurations, periodic trends and characteristic chemical properties. Work covers the reactions of Group I and Group II elements, the behaviour of Group IV elements, and how atomic size, ionization energy, electronegativity and metallic character change across periods and down groups.
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