Average composition of ordinary glass is:

N a_{2} O . C a O .6 S i O_{2}

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N a_{2} O .2 C a O .3 S i O_{2}

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N a_{2} O . C a O .6 S i O_{2} . C r_{2} O_{3}

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N a_{2} O . C a O . P b O .6 S i O_{2}

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Solution

The correct option is A $N a_{2} O . C a O .6 S i O_{2}$
Average composition of ordinary glasss $N a_{2} O . C a O .6 S i O_{2}$
It consist of approximately $75 %$ of silica.

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