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a
HCl
b
HF
c
HI
d
HBr
answer is B.
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Detailed Solution
Silica on heating to 1600oc changes to quartz glass quartz is the allotropic form of silica silica(glass) soluble in HF and forms hydrofluorosilicic acidSiO2+4HF→SiF4+2H2O 2HF+SiF4→H2SiF6