Q.
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a
The presence of dirt particles in between
b
The formation of solid silicate in-between by the reaction of SiO2 of glass with NaOH.
c
The formation of Na2CO3 in-between by the reaction of CO2 of air and NaOH.
d
Glass contains a boron compound which forms a precipitate with the NaOH solution.
answer is B.
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