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Q. Ordinary glass is formed by mixing of

Punjab PMETPunjab PMET 2009

Solution:

A mixture of silicates of sodium and calcium obtained by heating sodium carbonate, calcium carbonate and silica at about $1700\, K$, is called ordinary glass or soda glass.
$\ce{Na2CO3l +SiO2 + CaCO3->[1700 \,K] \underset{ordinary\, glass}{Na2SiO3 \cdot CaSiO3} \cdot 4SiO2 + CO2}$