A) The presence of dirt particles in between.
B) The formation of solid silicate in between by the reaction of \[Si{{O}_{2}}\] of glass with \[NaOH.\]
C) The formation of \[N{{a}_{2}}C{{\text{O}}_{3}}\] in between by the reaction of \[C{{O}_{2}}\] of air and \[NaOH.\]
D) Glass contains a boron compound which forms a precipitate with the \[NaOH\] solution.
Correct Answer: B
Solution :
[b] \[Si{{O}_{2}}+2NaOH\to \underset{Sodium\,silicate}{\mathop{N{{a}_{2}}Si{{O}_{3}}}}\,+{{H}_{2}}O\]
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