Discussion
Assertion (A): Lime is added to a soda silica glass rather than leaving soda as the only modifier.
Reason (R): Soda silica glass alone is attacked by water and would not survive in service.
Answer: D
Both are true and the reason gives the necessity: the historical name water glass belongs to exactly that soluble composition, and lime is what makes the glass durable enough for bottles and windows. Three components make up almost the whole batch.
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