A) \[N{{a}_{2}}C{{O}_{3}}+CaC{{O}_{3}}\]
B) \[N{{a}_{2}}C{{O}_{3}}+CaC{{O}_{3}}\]+silica
C) silica + \[N{{a}_{2}}C{{O}_{3}}\]
D) silica + borax
Correct Answer: B
Solution :
A mixture of silicates of sodium and calcium obtained by heating sodium carbonate, calcium carbonate and silica at about 1700K, is called ordinary glass or soda glass. \[N{{a}_{2}}C{{O}_{3}}+Si{{O}_{2}}+CaC{{O}_{3}}\xrightarrow{1700\,K}\] \[\underset{ordinary\,glass}{\mathop{N{{a}_{2}}Si{{O}_{3}}\cdot CaSi{{O}_{3}}\cdot 4Si{{O}_{2}}+C{{O}_{2}}}}\,\]
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